问题描述：
what to do 与how to do 的区别
I don't know ____________.
A.what to say or do B.what to say and to do C.how to say or do D.how to say and to do
I don't know ____________.
A.what to say or do B.what to say and to do C.how to say or do D.how to say and to do
问题解答：
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