I don't have to introduce him to you you know the boy．( )A．untilB．unlessC．sinceD．but 题目和参考答案——青夏教育精英家教网——

题目内容

18．I don't have to introduce him to you ______ you know the boy．（　　）

A．

until

B．

unless

C．

since

D．

but

分析既然你认识这个男孩，我就不必给你们相互介绍了．

解答答案：C 根据"I don't have to introduce him to you"（我没有必要介绍他给你）可知其后说的是没有必要的原因---you know the boy（你认识这个男孩）．until直到；unless除非；since既然；but但是．故用since更符合句意．故选C．

点评本题考查从属连词辨析．一般对于since的含义，我们记忆最多的就是"自从…"，所以知道since的"既然"之意是做题的关键．

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