单选题 Don't argue with him any longer. You are only wasting your breath ______ to win him over to your side.
A. having tried B. to try C. to be tried D. trying

【正确答案】 D
【答案解析】[解析] waste...on sth. 或waste...doing sth. ，用法同spend -样。waste one's breath“白费口舌”。