【单选题】【消耗次数：1】
They can’t leave until they _______ their work .
①
did
②
are doing
③
have done
④
his done
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【单选题】
They can’t leave until they _________ their work .
①
did
②
are doing
③
have done
④
his done
【单选题】
They can’t leave until they ___ their work.
①
did
②
are doing
③
have done
④
has done
【单选题】
8.They can’t leave until they ______ their work.
①
did
②
are doing
③
have done
④
has done
【单选题】
They have done things they ought_____.
①
not to do
②
not to be done
③
not to have done
④
not having done
【单选题】
Can anything be done to_________ the negative influence of some television programs?
①
accept
②
assume
③
avoid
④
alarm
【单选题】
28.Fool ____ Jane is, she could not have done such a thing.
①
who
②
as
③
that
④
like
【单选题】
I should think they have done it ________, to avoid paying you the money.
①
with purpose
②
on purpose
③
in purpose
④
to purpose
【判断题】
Given that they are fresh from the university, the young people have done a good job.
①
正确
②
错误
随机题目
【单选题】
盐析法沉淀蛋白质的原理是
①
中和蛋白质所带电荷，破坏蛋白质分子表面的水化膜
②
与蛋白质结合成不溶性蛋白盐
③
降低蛋白质溶液的介电常数
④
改变蛋白质溶液的等电点
⑤
使蛋白质溶液的pH=pI