My secretary usually opens my post ____

资格题库2022-08-02  29

问题 My secretary usually opens my post ____ it's marked “private”.(  )A. forB. asC. unlessD. if

选项 A. for
B. as
C. unless
D. if

答案 C

解析 句意:我的秘书通常会打开我的邮件,除非邮件标有“私人信件”字样。for为了,表示目的;as因为,表示原因;unless除非,表示否定条件;if如果,表示假设。C项符合题意,故选C。
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