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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

解析試題分析：句意：在過去瑪麗不會騎自行車，但現(xiàn)在她會啦。Can能，會，其過去式為could，所以選D。
考點：考查動詞時態(tài)。

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