The newly installed alarm system, which is directly connected to the-考呗网

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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

参考答案：C进入在线模考

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。乍一看应填人副词修饰被动结构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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