问题补充:
Due to bad weather,the police had tothe search for the missing boy.
A. resign
B. abandon
C. conduct
D. release
答案:
A. resign
(答案→)B. abandon
C. conduct
D. release
解析:考查动词辨析。句意:于天气恶劣,警方不得不放弃寻找那失踪的孩子。resign“辞职”;abandon放弃;conduct指导;release释放。根据此题干中的时间状语so far(迄今为止)可知应用现在完成时。故D正确。