问题
选择题
He paid for a seat, when he _________ have entered free.
A．could
B．would
C．must
D．need
答案
答案：A
could have done的意思是“本来可以做某事”。句子语境为“虽然他本来能够免费入场，但他买了票”。
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He paid for a seat, when he _________ have entered free.
A．could
B．would
C．must
D．need
答案：A
could have done的意思是“本来可以做某事”。句子语境为“虽然他本来能够免费入场，但他买了票”。