It was you had done made it possible for you to improve your English. A. that ; thatB. t

问题补充：

It was you had done made it possible for you to improve your English.

A. that ; that

B. that;what

C. what; what

D. what;that

答案：

A. that ; that

B. that;what

C. what; what

(答案→)D. what;that

解析：句意：就是你所做的提高了你的英语。it was …that强调句型，what引导主语从句，在据中作主语从句的宾语，强调句型强调的是主语从句的内容，故选D