--Did the medicine have a good _________...

--Did the medicine have a good __________?

--Yes, I could sleep well last night.

A. effort B. effect C. affect

B 【解析】试题分析： effort努力，effect影响，效果，作用，affect动词，影响。句意：这个药有效果吗？有，我昨天晚上睡的很好。故选B。考点：考查名词的用法。

考点分析：

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