单选题Although police could be&

单选题 Although police could be seen everywhere, they seemed to be searching the houses almost ________.A.at easeB.at randomC.at riskD.at length

B解析介词短语辨析。at ease安心;自在;不拘束; at random胡乱；at risk处于危险中；at length终于，最后,详细地；句意：尽管随处可以看见警察，但是他们似乎是在胡乱的搜查各个房子。

和我的回答一样，看来我也对了