问题
The old man told us _______ and ________.
A:to do what , to do how
B:what to do it, how to do it
C:what to do, how to do it
D:what to do , how to do
B:what to do it, how to do it
C:what to do, how to do it
D:what to do , how to do
正确答案是：
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