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题目内容
（河北农业大学大学英语Ⅳ）
A considerable period of time has to _______ before the effects of such security measures as closed-circuit television cameras and cell-phone monitoring become evident in reducing crimes.
A、
collapse
B、
elapse
C、
relapse
D、
prolapse
A、
collapse
B、
elapse
C、
relapse
D、
prolapse
参考答案
