______ a man knows what is not to be done, will he succeed in doing what is to be done.
A.
What if
B.
If only
C.
As if
D.
Only if
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【简答题】A.To emphasize the ers of the old method. B.To explain a step in the new technique. C.To show that the treatment will not cause fire. D.To illustrate a combination of old and new treatment.