Why do you set out so early in the morning?······Why do you set out so early in the morning?······——the rush hour.A.Avoiding B.avoided C.To avoid D.Avoid为什么选C不选A

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Why do you set out so early in the morning?······Why do you set out so early in the morning?······——the rush hour.A.Avoiding B.avoided C.To avoid D.Avoid为什么选C不选A

Why do you set out so early in the morning?······Why do you set out so early in the morning?······——the rush hour.A.Avoiding B.avoided C.To avoid D.Avoid为什么选C不选A
Why do you set out so early in the morning?
······Why do you set out so early in the morning?
······——the rush hour.
A.Avoiding B.avoided C.To avoid D.Avoid
为什么选C不选A

Why do you set out so early in the morning?······Why do you set out so early in the morning?······——the rush hour.A.Avoiding B.avoided C.To avoid D.Avoid为什么选C不选A
不定式,有表示目的的意思.动名词,或者现在分词都没有这个作用.
把全句都说出来,就是:
Why do you set out so early in the morNing?
I do so to avoid the rush hour.

why提问,说明说话者想知道原因,回答者自然要解释原因,说明目的了。
四个选项中只有B选项不定式才可以表目的。

表目的啊,提问用的why,你要不就用because引导的原因状语从句,要不就用to do 回答,没有用现在分词的

A. Avoiding ... 表示的是泛泛指的避开交通拥挤时段,不是具体的。
B. To avoid: 表示是具体的避开,那就是今天早时候的避开。
一般说来,动名词短语,往往有,泛泛的广义的含义,而不定式短语,则有具体的含义。