I don’t have to introduce him to you you know the boy..A. until B. unlessC. sinceD. but

发布时间：2020-08-21 08:07:51

I don’t have to introduce him to you      you know the boy..
A. until
B. unless
C. since
D. but

网友回答

A. until
B. unless
(答案→)C. since
D. but
解析：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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