题目内容
21、 He paid for a seat, when he _____ have entered free.
A. could B. would C. must D. need
试题答案
21、A
解析：此处考查情态动词的用法。Could have done“本能做某事，而事实为做成”；would have dong 只表虚拟，与过去的事实相反；must have done表对过去行为的肯定推测。Need 做情态动词不用于肯定句中。此处的意思是“他本可以免费进入的，但他已买了票。”故，选A。
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He paid for a seat, when he _________ have entered free.
A. could B. would C. must D. need
查看习题详情和答案>>He paid for a seat, when he _____ have entered free.
[ ]
A. could
B. would
C. must
D. need
查看习题详情和答案>>
B. would
C. must
D. need