问题描述：
I don't know ( ) the machine.Can you tell me?Wait a moment.I will tell you ___to start it.
A.what to do;how
B.what to do;what
C.how to do;what
D.how to do;how
A.what to do;how
B.what to do;what
C.how to do;what
D.how to do;how
问题解答：
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