【題目】He paid for a seat, when he ______ have entered free.
A.could
B.would
C.must
D.need

【答案】A
【解析】考查情態(tài)動詞。事實上.他沒能免費進入，所以他免費進入只是一種假設，要用虛擬語氣。橫線處可以填could,should表示虛擬，.故選A

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