The robber was caught by two men ______ police uniform _________.
A．in; at the onceB．in; at onceC．on,; at the onceD．on; at once
B
本題的含義是穿在警察制服的兩個(gè)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。
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