—I have been waiting for you so long.

—I have been waiting for you so long.
—Sorry, I have been in the library, _______ my friend look for some books.
A.helped B.helping C.to help D.help
jenbao0707 1年前 已收到1个回答 举报

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B

考察非谓语动词,根据句子结构可知,此处为状语,help的逻辑主语是I,help与逻辑主语I之间是主动关系,即选择B。

1年前

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