问题
选择题
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
答案
答案：B
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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
答案：B