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9. there is a storm or some other bad weather,the letter always comes on time.

   A. Because   B. If   C. When   D. Unless

9. D

9. D解析:考查条件状语从句。从全句判 断,该句为主从复合句,即“从句+主句” 构成的复合句。从句表示条件,为条件状 语从句。

because和when不能引导条件 状语从句;if经常引导条件状语从句,但 意为“如果……”,不符合句子的含义。

unless意为“除非,如果不” (=if not) 。

题目来源:2016年周测月考直通高考高中英语必修4外研版 > 周内课时练12 Period 4 Grammar & Writing

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