【題目】You can’t dial 110 ____ you are in an emergency and in need of help.

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

【答案】C

【解析】句意:除非你遇到緊急情況,需要幫助,否則你不能撥打110。A. if 如果;B. until到…為止;C. unless除非,如果不;D. though盡管。只有在遇到緊急情況時才能撥打110,此句是unless引導(dǎo)的條件狀語從句,故答案為C。

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