【題目】Many people believe we will face serious problems ______we take action to change the way we live.

A. but B. though C. unless D. until

【答案】C

【解析】句意:許多人們相信我們應(yīng)該面對嚴(yán)重的問題,如果我們不采取行動來改變我們的生活方式。A. but但是;B. though盡管;C. unless除非;D. until直到。這里是unless引導(dǎo)的條件狀語從句。根據(jù)題意,故選C。

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