—— Do you still remember the day when we went to the Great Wall?
—— I can’t remember it well, but＿＿＿＿＿＿sometime last autumn?
A．might it beB．could it have beenC．could it beD．must it have been
B
could have done表示對過去發(fā)生情況的可能性推測。
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