【題目】In summer, food will go bad quickly ________ we put it into a fridge.

A. if B. unless C. as soon as D. while

【答案】B

【解析】

句意:夏天,除非我們把食物放進(jìn)冰箱里,否則食物很快就會(huì)變壞。A. if如果;B. unless除非;C. as soon as一……就;D. while正當(dāng)……的時(shí)候。根據(jù)生活常識(shí),在夏天只有放在冰箱里的食物才能保證不變質(zhì),unless除非,如果不,相當(dāng)于if not,引導(dǎo)條件狀語從句,故答案為B。

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