题目内容

---Do you still remember when we went to Chong qing?
----I can’t remember now but_____ sometime last summer?
A．could it beB．might it beC．must it have beenD．could it have been
D

试题分析：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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