Question

I would have told him the answer had it been possible, but I __________ so busy then.

I would have told him the answer had it been possible, but I __________ so busy then.
A. was
B. were
C. had been
D. would be

Answer 1

答案：A

翻译：如果可能的话，我本来早就告诉他答案了，但是我当时那么忙。

解释：
1. 从句意来看，逗号前的句子是对过去发生的动作进行的虚拟，即：
I would have told him the answer had it been possible
= I would have told him the answer (if it had been possible)
2. 而逗号后面的句子当然也就是对过去发生的事实进行的描述，再根据其时间状语then，所以只需用一般过去时即可，即答案A为正解。

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Answer 2

was,前面是虚拟语气，本应该告诉他答案
但我真的很忙，这个忙是过去的事情，已经结束，而且事实，所以用一般过去时。

Answer 3

选C。这是考查与过去事实相反的虚拟语气。

追问

这是你百度的答案还是你自己想的答案呢？总之是错的！

Answer 4

was 过去式