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39. He paid for a seat, when he ______ have entered free. A. could B. would C. must D. need
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zhaofeifei：同意选A。could have done本可以做某事而没做，但好象不是虚拟吧(2009-02-02 15:55)
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YANGXIAOXIN：对哦！！！！！！！！！！！！(2009-02-02 15:32)
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zitanfx：选A。could have entered free 是本可以免费进去但是却没有，是虚拟吧(2009-02-02 12:36)
