Madonna ____a straight A student,but it was dancing that she was really crazy about.?   
A．must beB．could be?C．must have beenD．could have been?
D    
 考查情態(tài)動詞。根據(jù)題干后一個分句中的過去時態(tài)可排除A、B兩項；C項的意思是“一定是”；D項的意思是“本來能夠是”。句意為：Madonna本來可以成為一個全優(yōu)生，但是她真正著迷的是舞蹈。根據(jù)題意可知，D項正確。
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