一道情态动词的选择题David paid for a seat,when he __have entered free.

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一道情态动词的选择题
David paid for a seat,when he __have entered free.
A must
B could
C need
D should
Why?这几个情态动词在这道题里有什么区别呢

B
David本可以免费进入的但他却买了票.
could have done表示本可以这么做但却没有这么做.
must have done表示判断,一定怎么怎么做了或者怎么怎么样了比如he must have died他肯定是死了.
should have done表示应该这么做却没有这么做,通常带有惋惜等情感.比如：i should have listened to you我真该听你的（我没有听导致了一些不好的不愿意看到的结果）

一道情态动词的选择题David paid for a seat,when he __have entered free. He paid for a seat,when he ----have entered free.A.could B.w he paid for a seat ,however,he ___have entered free He paid for a seat,when he could have entered free. He paid for a seat when he _____ have entered free.(could /w He paid for a seat,when he ___ have enter free. 一道英语情态动词的选择题一道关于情态动词的选择题一道有关情态动词的英语选择题 Yes ,but she paid for a ticket when she could have entered f 一道英语情态动词选择题一道英语情态动词选择题~