题目内容

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    
 考查情态动词。根据题干后一个分句中的过去时态可排除A、B两项；C项的意思是“一定是”；D项的意思是“本来能够是”。句意为：Madonna本来可以成为一个全优生，但是她真正着迷的是舞蹈。根据题意可知，D项正确。
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