The newly installed alarm system, which&nbs-考呗网题库移动版

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

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 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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单选题
The airline requested a__________ call to ensure a seat on my flight back home.

A． confirm
B． confirmed
C． Confirming
D． confirmation

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单选题
If the task is too complicated to figure out on__________ own, please don't hesitate to ask one of our representatives, who are here to help.

A． you
B． Your
C． yours
D． yourself

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单选题
The hard work put in during his younger years made him become__________ sound in his later years.

A． finance
B． finances
C． financial
D． financially

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