In such a fierce competition, a person has to make every effort if he ______ .
A．has succeededB．is to succeedC．would succeedD．will succeed
B
句意：在如此激烈的競爭下，一個人要想成功，就必須竭盡全略。If條件句中可用be to結(jié)構(gòu)表示按事態(tài)發(fā)展，最終會……，或注定會……。
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