______ 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
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D解析考查倒装句。Only放在句首并强调状语时,使用部分倒装句。本题only 放在了句首,且if a man knows what is not to be done是一个条件状语从句,所以选D;句意:只有当一个人知道了不应该做的事情,他才能成功地做应该被做的事情。