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Although police could be seen everywhere, they seemed to be searching the houses almost ________.
A．at easeB．at randomC．at riskD．at length
B
介詞短語辨析。at ease安心;自在;不拘束; at random胡亂；at risk處于危險中；at length終于，最后,詳細地；句意：盡管隨處可以看見警察，但是他們似乎是在胡亂的搜查各個房子。
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