( )there when the accident occurred,i would not have believed itA.hadn't i been b.if i wasn't c.if i weren't D.had i not been解答的时候要有每个选项的解释

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( )there when the accident occurred,i would not have believed itA.hadn't i been b.if i wasn't c.if i weren't D.had i not been解答的时候要有每个选项的解释
( )there when the accident occurred,i would not have believed it
A.hadn't i been b.if i wasn't c.if i weren't D.had i not been
解答的时候要有每个选项的解释

( )there when the accident occurred,i would not have believed itA.hadn't i been b.if i wasn't c.if i weren't D.had i not been解答的时候要有每个选项的解释
选D
这是已经发生了的动作的假设,结构为：
if＋主＋had ＋p.p.,主＋should/would (not)＋have p.p.
这里从句里的if也可以省略,但要用倒装；把助动词提前,但是不提前否定词.即把had提前即可.
Had i not been there when the accident occurred,i would not have believed it.
如果事故发生的时候我不在那里,我就不会相信了.
只有D符合,其他的ABC就排除掉啦.

A.
原句是 If I hadn't been there when the accident occered,I would not have believed it.
这里是倒装形式
Hadn't I been there when the accident occerd,I would not have believed it.
这是过去完成时。
翻译：如果我没有在事故发生时到那，我是不会相信的。
O(∩_∩)O~

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