【单选题】【消耗次数:1】
If I had had enough time, I __________ it well.
would do
would have done
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【单选题】 mso-bidi-font-family:宋体;mso-font-kerning:0pt;mso-ansi-language:EN-US; mso-fareast-language:ZH-CN;mso-bidi-language:AR-SA;mso-bidi-font-weight:bold">平行剖切面剖视图所用的剖切平面是
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②  两个相交的剖切平面
③  两个剖切平面
④  几个平行的剖切平面