【单选题】【消耗次数：1】
He said that his sister ?[填空]been there one week before
①
had
②
has
③
have
④
will have
参考答案：
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相关题目
【单选题】
The sandwhich course, [填空]I have been on for a week ,is really excellent.
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which
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【单选题】
Does Robert have [填空] computer? —Yes,he has [填空] ．
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an,some
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a,/
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The hospital is said to have been ________________ in the Second World War.
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declined
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I hope ___ the little ___ I have been able to do has been of some use.
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that; that
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what; what
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To survive such an ( ) of a car crash, one has to have incredible luck.
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collision
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【单选题】
He might have been killed ____ the timely arrival of the ambulance.
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but for
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except for
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【单选题】
He might have been killed _____the timely arrival of the ambulance.
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but for
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besides
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随机题目
【判断题】
n阶行列式中的元素<img class=jc-formula data-tex={ a }_{ ij } src=https://huaweicloudobs.ahjxjy.cn/32CD16465E593443F4069319DD123F4B.png style=vertical-align: middle;/>的余子式<img class=jc-formula data-tex={ M }_{ ij } src=https://huaweicloudobs.ahjxjy.cn/51D2BE0410A73F118E4831950E2CFB96.png style=vertical-align: middle;/>与代数余子式<img class=jc-formula data-tex={ A }_{ ij } src=https://huaweicloudobs.ahjxjy.cn/A9614CAB42E922F0A8175A6CB0EF9AF2.png style=vertical-align: middle;/>的关系是<img class=jc-formula data-tex={ A }_{ ij }=-{ M }_{ ij } src=https://huaweicloudobs.ahjxjy.cn/91AA157C8E124B5A38E5AF657B400834.png style=vertical-align: middle;/>.
①
正确
②
错误
【判断题】
若A,B都不可逆，则<img class=jc-formula data-tex=A+B src=https://huaweicloudobs.ahjxjy.cn/226CA442F3665B89B8F76C651394C768.png style=vertical-align: middle;/>也不可逆.
①
正确
②
错误
【单选题】
已知4阶行列式中第2行元素为－1，0，2，a，第4行元素的余子式依次为10，5，9，2，则<img class=jc-formula data-tex=a= src=https://huaweicloudobs.ahjxjy.cn/C292F694DF57BF1C2766522AF17BCC7D.png style=vertical-align: middle;/> [填空].
①
0
②
4
③
7