_______,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

来源:学生作业帮助网 编辑:六六作业网 时间:2024/12/24 08:44:00
_______,ourexperimentwouldhavefailed.A.ShouldhenothelpusB.DidhenothelpusC.HadhenothelpedusD.Ifhehasn

_______,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
_______,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

_______,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,...

全部展开

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

收起

C