问题描述：
这类型的题要怎么做,什么情况下要倒装
I want to know_do to help my neighbours.
A.what I can B.what can I
C.how I can D.how can I
I want to know_do to help my neighbours.
A.what I can B.what can I
C.how I can D.how can I
问题解答：
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