I just don’t understand that prevents so many children at school from being as happy as o

发布时间：2020-08-16 16:28:18

I just don’t understand      that prevents so many children at school from being as happy as one might expect.
A. what it is
B. what it does
C. what is it
D. why is it

网友回答

(答案→)A. what it is
B. what it does
C. what is it
D. why is it
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