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The glass doors have taken the place of the wooden ones at t

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The glass doors have taken the place of the wooden ones at the entrance,_____ in the natural light during the day.
A.to let B.letting C.let D.having let
答案给的是B,为什么不选A?A也表主动啊,而且也是非谓语.
在这儿都做结果状语.不定式表示的结果通常是未曾料想到的结果,不太好的结果;而现在分词表示的结果,则强调自然发展的结果.如:They lifted the rock only to drop it on their own feet .
Football is played all over the world ,making it the most popular sport .
选B