---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

試題分析：句意：——你還記得我們什么時候去的重慶？——我現(xiàn)在記不清了，但是可能是不是去年夏天某個時候呢？。對過去事實的推測用情態(tài)動詞+have done,故排除AB。用于一般疑問句用情態(tài)動詞could,用于肯定句用情態(tài)動詞must。故選D。
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