．— Why does Michael know so much about Angkor Watt?　　　　— He have been there or...A. must

问题补充：

．— Why does Michael know so much about Angkor Watt?

— He have been there, or...

A. must

B. oughtn’t to

C. may

D. can’t

答案：

A. must

B. oughtn’t to

(答案→)C. may

D. can’t

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