Question

—It is so hot today. Why not swim in the river?

—No, we can't swim in the river. Our teachers and parents always warn us _______________ in the river.

A.to not swim B.swimming C.not to swim D.not swimming

Answer

C

【解析】

考查不定式的否定形式及不定式作宾补的用法。句意：——今天太热了。为什么不在河里游泳呢？——不，我们不能在河里游泳。我们的老师和父母总是警告我们不要在河里游泳。这太危险了。警告某人warn sb. not to do sth，意为：不要做某事。根据句意及选项可知，老师和父母总是警告我们不要在河里游泳，需用warn us not to swim in the river。故选C。