1．That's why I help brighten people's days．If you __________，who is to say that another person will？（　　）
A．didn'tB．don'tC．weren'tD．haven't

分析 那就是我為什么幫助照亮人們生活的原因．如果你不這樣做，誰(shuí)又能保證別人就會(huì)去做呢？

解答 答案：B
后一句是if引導(dǎo)的條件狀語(yǔ)從句，主句用一般將來(lái)時(shí)，從句用一般現(xiàn)在時(shí)代替．而A、C兩項(xiàng)是過(guò)去式；D項(xiàng)是現(xiàn)在完成時(shí)，與題干不符．只有助動(dòng)詞do可代替實(shí)意動(dòng)詞．故選B．

點(diǎn)評(píng) 判斷助動(dòng)詞的用法既要看時(shí)態(tài)，又要看形式．have有時(shí)雖然可以用作為助動(dòng)詞，但是不能代替實(shí)意動(dòng)詞．

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