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问题: The glass doors have taken the place of the wooden

The glass doors have taken the place of the wooden ones at the entrance,_____ in the natural light during the day。
为什么填letting不填to let

解答:

用letting是因为这是现在分词做伴随状语,作主句The glass doors have taken the place of the wooden ones at the entrance的伴随状语,因为将木门换成玻璃门这个动作和让阳光照进来是同时发生的;to let是动词不定式,只能做目的状语或结果状语,如果想用to let,可以把句子的逗号去掉,The glass doors have taken the place of the wooden ones at the entrance to let in the natural light during the day。