题目内容：

____the room,a letter was laid on the ground.A.Entering B.Having entered C.He entered D.Mrs Gr

优质解答

这个考察的是非谓语动词和独立主格结构这块的内容.20.______ the room,a letter was laid on the ground.这个句子中逗号后面已经是个完整句子啦,有自己的主语和谓语,所以,逗号前的部分只可能是：从句；非谓语动词结...