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 Hepaidforaseat,whenhe______haveenteredfree.A.could  B....

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問題詳情:

 Hepaidforaseat,whenhe______haveenteredfree.A.could  B....

 He paid for a seat, when he ______ have entered free.

A. could   B. would    C. must    D. need

【回答】

A

知識點:虛擬語氣與情態動詞

題型:選擇題