-I saw Jim and your brother in the park yesterday morning.-they ---- skating there,right?A.practiced B.were practicing C.have practiced D.have been practicing

问题描述:

-I saw Jim and your brother in the park yesterday morning.-they ---- skating there,right?
A.practiced B.were practicing C.have practiced D.have been practicing

B啊,看到是一瞬间的事情,所以一定是过去进行时
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D 过去进行时对现在没有影响。

选B
看见某人在做某事,用现在进行时,因为是昨天,所以用过去进行时.