Question

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

A.to swimB.not to swimC.swimming

Answer 1

【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”用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。