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Mary_______ not ride a bike in the past,but now she_______ do it.

A.can;can B.can;could
C.could;could D.could;can

D

解析试题分析:句意:在过去玛丽不会骑自行车,但现在她会啦。Can能,会,其过去式为could,所以选D。
考点:考查动词时态。

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