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【题目】Look at the sign "No swimming", it warns us ________ in the lake.

A.to swimB.not to swimC.swimming

【答案】B

【解析】

句意:看那个标志禁止游泳,它警告我们不要在湖里游泳。

考查动词不定式的否定。to swim动词不定式;not to swim动词不定式的否定;swimming动名词。表示警告某人不要做某事warn sb. not to do;否定词not放在动词不定式的前面,此处用warn us not to swim。故选B

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