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
网友回答
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