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 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

出自：河北农业大学大学英语Ⅳ

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