Question

The robber was caught by two men ______ police uniform _________.

A．in; at the once

B．in; at once

C．on,; at the once

D．on; at once

Answer 1

B

本题的含义是穿在警察制服的两个人立刻抓住了抢劫犯，in表示穿什么衣服，at once表示立刻的意思，故本题选B。