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(2013·高考新课标全国卷Ⅰ)If we________now to protect the environmentwe’ll live to regret it.

Ahadn’t acted? Bhaven’t acted

Cdon’t act? Dwon’t act

 

【答案】

C

【解析】C。本题考查时态呼应。Ahadn’t acted是过去完成时,表示过去的过去Bhaven’t acted 是现在完成时,指的是过去的动作对现在产生的影响或结果;C项是一般现在时,表示现在的经常性行为;Dwon’t act是一般将来时,指的是将来的动作。句意:如果我们现在不保护环境,将来我们会后悔的。根据在含有条件或时间状语从句的主从复合句中,如果主句的谓语动词用一般将来时,那么从句中的谓语动词常用一般现在时代替一般将来时这一语法规则,以及该题主句的谓语动词用了一般将来时的客观事实来判断,本题答案选C项。

 

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