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

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

admin2022-11-01  197
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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