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  3. The newly installed alarm system, which is directly connected to the police, wil

The newly installed alarm system, which is directly connected to the police, wil

游客2025-06-15  15
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______ 60 seconds 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 secondsof 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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