问题描述：
选择He didn't know ( )about it
A.what to do B.how to do C.to do what D.how he can do 翻译词组 1.一直 2.列表
A.what to do B.how to do C.to do what D.how he can do 翻译词组 1.一直 2.列表
问题解答：
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