题目内容
20.Police searched for the missing gunman,so they had to change the plan.( )A. | in place | B. | in sight | C. | in effect | D. | in vain |
分析 警察没有找到失踪的枪手,因此他们不得不改变计划.
解答 答案:D.根据结果"so they had to change the plan"表明警察未搜到枪手的下落,in vain为"徒劳,无功",符合题意.而A.in place适当地,B.in sight看得见,C.in effect奏效,均不合题意.
点评 本题考查介词短语的辨析.需要学生对介词短语的含义多加积累,根据句意选择合适的短语.

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