My secretary usually opens my post _____ it's marked "private".
My secretary usually opens my post _____ it's marked "private".
A、unless
B、if
C、as
D、for
【正确答案】:A
【题目解析】:此题考查连词词意。Unless除非,if如果,as当……的时候,for因为。根据题意,一旦注明是“私人信件”,秘书就不能打开了。选项A是正确的。【句子大意】通常是我的秘书开我的邮件,除非注“私人”字样。
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