yes they may have done 为什么不能用can
人气：381 ℃ 时间：2020-04-22 22:50:34
解答
can have done 通常只用于疑问句和否定句；用于疑问句时表怀疑,用于否定句时表不确定.
例如：
Can they have left so soon?
难道他们这么快就走了?（表怀疑）
He can’t have been to that town．
他不可能去过那座城市.（表不确定）
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