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When Mary was young,she ( )adle to dance very well?A.could b

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When Mary was young,she ( )adle to dance very well?A.could be B.can be C.was D.could
C
翻译:当玛丽年轻/小时,她能跳舞跳得很好.
1.句子时间状语从句When Mary was young,很明显表明主句应该用一般过去时,而B为一般现在时,排除.
2.固定短语be able to do sth = can do sth,用在一般过去时为:was/were able to do sth = could do sth,意思是“能够/会做某事”.
A错在can和be able to不能重复使用.