Question

In hot summer, milk quickly turns sour       it is refrigerated.

A．while

B．if

C．until

D．unless

Answer 1

D

試題分析：考查連詞，A. while當…時候B. if如果C. until直到…D. unless除非，引導條件狀語從句，句子意思“在炎熱的夏季，牛奶很快變酸除非被冷藏”
點評：連詞是高考常考內容，判斷從句中用哪個連詞，需要記住連詞的用法，需要考生平時多練習，本題主要考查unless的用法，要求考生掌握好它的用法
即學即練：It will be quite a long time _______ she is back again, so don’t be too cross with her.
A. before                   B. since                C.that          D. until
選A