______ a man knows what is not to be done, will he succeed in doing what is to be done.
A．What ifB．If onlyC．As ifD．Only if
D
考查倒裝句。Only放在句首并強(qiáng)調(diào)狀語時(shí)，使用部分倒裝句。本題only 放在了句首，且if a man knows what is not to be done是一個(gè)條件狀語從句，所以選D；句意：只有當(dāng)一個(gè)人知道了不應(yīng)該做的事情，他才能成功地做應(yīng)該被做的事情。
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