摘要： 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 B 解析 句意为:在入口处玻璃门已取代了木头门.在白天能让自然光进来.空白处在句中作状语.let与句 子的主语之间是主谓关系.且动作是同时发生的.故用现在分词形式.

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