问题补充：
Mother always complains that children their shoes very quickly.
A. find out
B. wash out
C. wear out
D. set out
答案：
A. find out
B. wash out
(答案→)C. wear out
D. set out
解析：句意为：母亲总是抱怨孩子们的鞋磨损得很快。find out 发现，查出（真理/真相）wash out 洗掉，破产 set out 出发，着手wear out用坏；穿破；（使）筋疲力尽；耗尽。
【考点定位】动词短语语境运用考查wear out 短语可以在必修四第三单元A master of nonverbal humour 一文中The tramp, a poor, homeless man with a moustache, wore large trousers, worn-out shoes and a small round black hat.句子里找到踪影。即形容词worn-out。动词短语wear out有“用坏；穿破；（使）筋疲力尽；耗尽”之意。如：Clothing seems towearoutin no time nowadays。（现在的衣服好像很快就穿破了。）The past few days had really worn him out. （过去的几天真把他给累坏了。）No matter how often they turn up, their welcome never wears out. （不管他们多久露面一次，都永远那么受欢迎。）
