2. 财经
  3. The newly installed alarm system，which is directly connected t0 the police，will go off if the correct security code is not enter

The newly installed alarm system，which is directly connected t0 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 t0 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 seconds of touching thekeypad应作状语。因此横线处应填人介词，从而构成介宾短语作状语。
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