Question

i ____him the answer ___possible ,but i was so busy then .

a could tell ; if it had been b must have told ;were it c should have told ;had it been d should have told ;should it be
选什么呀 为什么呀

Answer 1

答案A
原因：
从but引导的分团茄句可以看出前半句需引用虚拟语气；也就是说，因为忙没有告诉他并谨答案...
A答案符合虚拟语气要求，BCD三种答案应把从句部分放句首，这样倒装才合理...
以上解释仅供参考...谢谢采绝或基纳!

Answer 2

A