_______,our experiment would have failed.A.Should he not help us B.Did he not help us C.Had he not helped us D.If he has not helped us
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_______,our experiment would have failed.
A.Should he not help us
B.Did he not help us
C.Had he not helped us
D.If he has not helped us
C
D
c
c,虚拟语气
C
由后一句我们的实验将会失败(而且此句用了过去将来完成时),可知前面应该用过去完成时了,因为省略了if所以had提前,句子倒装。
c
C,后面是过去将来完成时,虚拟语气,对应的是过去完成时。
过去将来完成时态的基本的用法
1)表示在过去将来某时间以前发生的动作,并且会对过去将来某一时间产生影响。
He told me he would have finished it by 9.
他告诉我他将在9点钟的时候完成。
2)用在虚拟语气
If you had not helped me,...
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C,后面是过去将来完成时,虚拟语气,对应的是过去完成时。
过去将来完成时态的基本的用法
1)表示在过去将来某时间以前发生的动作,并且会对过去将来某一时间产生影响。
He told me he would have finished it by 9.
他告诉我他将在9点钟的时候完成。
2)用在虚拟语气
If you had not helped me,I would not have succeeded.
如果你不 帮我,我 是不会成功的。
http://www.grammarspot.com/html/Tenses/Perfect_tense/20070827/258.html
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C
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