21、 He paid for a seat, when he _____ have entered free.
A. could B. would C. must D. need
21、A
解析：此處考查情態(tài)動(dòng)詞的用法。Could have done“本能做某事，而事實(shí)為做成”；would have dong 只表虛擬，與過(guò)去的事實(shí)相反；must have done表對(duì)過(guò)去行為的肯定推測(cè)。Need 做情態(tài)動(dòng)詞不用于肯定句中。此處的意思是“他本可以免費(fèi)進(jìn)入的，但他已買(mǎi)了票。”故，選A。
科目：高中英語(yǔ) 來(lái)源： 題型：
He paid for a seat, when he ______ have entered free.
A. could B. would C. must D. need
科目：高中英語(yǔ) 來(lái)源： 題型：
He paid for a seat, when he ______ have entered free.
A. could B. would C. must D. need
科目：高中英語(yǔ) 來(lái)源： 題型：
He paid for a seat, when he _________ have entered free.
A. could B. would C. must D. need
科目：高中英語(yǔ) 來(lái)源： 題型：
He paid for a seat, when he _____ have entered free.
A. could B. would C. must D. need
科目：高中英語(yǔ) 來(lái)源： 題型：
He paid for a seat, when he ______ have entered free.
A. could B. would C. must D. need
科目：高中英語(yǔ) 來(lái)源： 題型：
He paid for a seat, when he _____ have entered free.
A. could B. would C. must D. need
科目：高中英語(yǔ) 來(lái)源：2005年高考試題（山東卷）解析版 題型：單項(xiàng)填空
He paid for a seat, when he ______ have entered free.
A. could B. would C. must D. need
科目：高中英語(yǔ) 來(lái)源：同步題 題型：單選題
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科目：高中英語(yǔ) 來(lái)源：山東省高考真題 題型：單選題
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科目：高中英語(yǔ) 來(lái)源： 題型：
He paid for a seat, when he _____ have entered free.
A. could B would C. must D. need
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