语法与词汇 17.Don't waste your______trying to persuade them: they'll never listen.
【正确答案】 D
【答案解析】此题考点为固定搭配。waste one’s breath意为“白费唇舌，白说”，如：He isdeaf to advice．You’re just wasting your breath．别人的劝告他全听不进去。你这是白费唇舌。