Question

I couldn't have passed the exam if I ______ the night before.

A.didn't work hard
B.wouldn't work hard
C.haven't worked hard
D.hadn't worked hard
该选哪个呢？为什么？谢谢解答

Answer 1

你好。答案是D。

这道题考的是 if条件句的虚拟语气的用法。用法一般是 if I+ had+过去分词，那么主句要用 I would/could have+过去分词。

I couldn't have passed the exam if I __D____ the night before.

A.didn't work hard

B.wouldn't work hard

C.haven't worked hard

D.hadn't worked hard

Answer 2

选D：hadn't worked hard；这是对过去情况的虚拟，所以if要用过去完成时。

Answer 3

答案b
考查状语从句。语境表示“直到我再也难以支撑的时候”，用until引导时间状语从句表示“直到……的时候”。

Answer 4

选D
had not worked hard。