问题补充：
The mother, who is strict with her two daughters, has a clear list of they are not permitted to do.
A. why
B. how
C. what
D. which
答案：
A. why
B. how
(答案→)C. what
D. which
解析：C 引导宾语从句。空格处引导宾语从句，作为of的宾语，且在参加中做do的宾语，使用what。故C正确。
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