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

本題的含義是穿在警察制服的兩個人立刻抓住了搶劫犯，in表示穿什么衣服，at once表示立刻的意思，故本題選B。