The newly installed alarm system,which is directly connected to the police,will go off if the correct security code is not enter

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问题 The newly installed alarm system,which is directly connected to the police,will go off if the correct security code is not entered ________ 60seconds of touching the keypad.

选项 A、only   
B、under
C、within
D、directly

答案C

解析 备选答案为副词和介词。首先应分析句子结构,判断横线处应填入介词还是副词。乍一看应填入副词修饰被动结构“is not entered”,实际上if从句是被动语态,“ ________ 60 seconds of touching the keypad”应作状语。因此横线处应填入介词,从而构成介宾短语作状语。
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