问题补充:
---Do you still remember when we went to Chong qing?
----I can’t remember now but sometime last summer?
A. could it be
B. might it be
C. must it have been
D. could it have been
答案:
A. could it be
B. might it be
C. must it have been
(答案→)D. could it have been
解析:句意:——你还记得我们什么时候去的重庆?——我现在记不清了,但是可能是不是去年夏天某个时候呢?。对过去事实的推测用情态动词+have done,故排除AB。用于一般疑问句用情态动词could,用于肯定句用情态动词must。故选D。
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