问题补充:
I don’t have to introduce him to you you know the boy..
A. until
B. unless
C. since
D. but
答案:
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
时间:2020-01-07 03:35:05
I don’t have to introduce him to you you know the boy..
A. until
B. unless
C. since
D. but
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