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-where were you when the UFO arrived?-I was _______ the library.A.at the front of B.in front of

题目详情
-where were you when the UFO arrived?-I was _______ the library.A.at the front of B.in front of
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答案和解析
B in front of
在.前面【在范围外】
at the front of 是在某一范围内的前面