题目内容
1.That's why I help brighten people's days.If you __________,who is to say that another person will?( )A. | didn't | B. | don't | C. | weren't | D. | haven't |
分析 那就是我为什么帮助照亮人们生活的原因.如果你不这样做,谁又能保证别人就会去做呢?
解答 答案:B
后一句是if引导的条件状语从句,主句用一般将来时,从句用一般现在时代替.而A、C两项是过去式;D项是现在完成时,与题干不符.只有助动词do可代替实意动词.故选B.
点评 判断助动词的用法既要看时态,又要看形式.have有时虽然可以用作为助动词,但是不能代替实意动词.
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