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一、某些情态动词+have+动词过去分词
1)“could have+done”意为“本来能做……实际上未做”。此意常用在肯定句。
[真题再现]
① He paid for a seat, when hehave entered for free.(2005山东)
A.could B.would
C.must
D.need
1)“could have+done”意为“本来能做……实际上未做”。此意常用在肯定句。
[真题再现]
① He paid for a seat, when hehave entered for free.(2005山东)
A.could B.would
C.must
D.need