[题目]In summer milk will quickly go bad it is put into a fridge.A. though B. unless C. because D. once 题目和参考答案——青夏教育精英家教网——

题目内容

【题目】In summer milk will quickly go bad _____it is put into a fridge.

A. though B. unless C. because D. once

【答案】B

【解析】两个分句的句意：在夏天牛奶很快会变质，它被放在冰箱里。though尽管；unless除非，如果不；because因为；once曾经。根据句意“在夏季，牛奶如果不放在冰箱中，就会很快变坏”，结合unless=if...not引导条件状语从句，可知选B。

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