问题
选择题
______ 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
答案
答案：D
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______ 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
答案：D