【題目】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】兩個分句的句意：在夏天牛奶很快會變質，它被放在冰箱里。though盡管；unless除非，如果不；because因為；once曾經(jīng)。根據(jù)句意“在夏季，牛奶如果不放在冰箱中，就會很快變壞”，結合unless=if...not引導條件狀語從句，可知選B。

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