you are supposed to do you dont like a thing is change it. Dont complain.A. That; why

you are supposed to do you don't like a thing is change it. Don't complain.
A. That; why
B. What; when
C. What; where
D. That; how

A. That; why(答案→)B. What; whenC. What; whereD. That; how解析：B　句意：当你不喜欢一件事情时，你应该做的是改变它。不要抱怨。“ you are supposed to do”为主语从句，该从句缺少宾语，表示“事物”且语境中并无选择含义，故用what引导；“ you don't like a thing”为时间状语从句，作are supposed to do的状语，说明其时间，故用when引导。因为主语从句“What you are supposed to do”中含实义动词do，故is后的表语需为省去不定式符号的不定式，故change作表语。

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