根据网考网考试中心的统计分析,以下试题在2017/11/3日托业考试习题练习中,答错率较高,为:84%
【单选题】The newly installed alarm system, which is directly connected to the police, will go off if the correct security code is not entered ______ 60 seconds of touching the keypad.
A.only
B.under
C.within
D.directly
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