[单选题]The search was()when the fog got thicker.

A

called off

B

called on

C

called in

D

called for

正确答案:A
题目解析

call off "取消,叫走”;"call on“号召,呼吁,邀请,访问”;"call in“召集,来访”; call for “要求,提倡”。句意:雾变得越来越大导致调查取消了。故选A

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