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

题目内容

I don’t have to introduce him to you ________ you know the boy..

A．until

B．unless

C．since

D．but

C

当从句中有since+一般过去时，主句用现在完成时，故选C

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