I’d rather you did some social research when you are free but you .A. didn’tB. weren’tC.

问题补充：

I’d rather you did some social research when you are free, but you .

A. didn’t

B. weren’t

C. wouldn’t

D. don’t

答案：

A. didn’t

B. weren’t

C. wouldn’t

(答案→)D. don’t

解析：would rather 后接宾语从句，从句中用一般过去时，表示与现在事实相反的假设或愿望，连词but引出现在的情况，故答案为D项一般现在时。