. 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
网友回答
A. to let
(答案→)B. letting
C. let
D. having let
解析：
B。此处用现在分词表示结果。又如：It rained heavily, causing severe flooding in that place. 大雨滂沱，造成了那个地方洪水泛滥。