In such a fierce competition, a person has to make every effort if he_______.

A．has succeededB．would succeedC．will succeed D．is to succeed

D

解析試題分析：考查be to do用法.be to do sth表示一定要做某事；必須坐某事；if引導(dǎo)條件狀語從句，句子里使用一般現(xiàn)在時代替將來時。句意：在如此激烈的競爭中，如果一個人要成功，他不得不非常努力。故D正確。
考點：考查be to do 用法
點評：be to do sth是高中一個非常重要的結(jié)構(gòu)，可以表示將來時，也可以表示一定要做某事；必定要做某事；在具體使用中要加以辨析。

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