一道高中英语题.求解~谢谢20. ______ the room, a letter was laid on the ground.A. Entering B. Having enteredC. He entered D. Mrs Green entering为什么选D不选A啊.?求解 ~谢谢.

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一道高中英语题.求解~谢谢20. ______ the room, a letter was laid on the ground.A. Entering B. Having enteredC. He entered D. Mrs Green entering为什么选D不选A啊.?求解 ~谢谢.
一道高中英语题.求解~谢谢
20. ______ the room, a letter was laid on the ground.
A. Entering B. Having entered
C. He entered D. Mrs Green entering
为什么选D不选A啊.?
求解 ~谢谢.

一道高中英语题.求解~谢谢20. ______ the room, a letter was laid on the ground.A. Entering B. Having enteredC. He entered D. Mrs Green entering为什么选D不选A啊.?求解 ~谢谢.
D. Mrs Green entering
这是独立主格.
前后主语不一致时,就要这么说. 前面用分词结构,后面是正常句子.
A不行,是因为表意不清, 单独一个分词,不知道动作是谁发出的,要加上D那样的逻辑主语.
如果说:He entering the room 就行了.
不然,不知道动作的发出者,句子意思是不明确的.

因为前后的主语不一致

如果选A，主语就变成a letter了，letter不可能enter the room啊。所以要选D，主语是Mrs

因为后面半句开头是a letter ，选A的话就是说a letter 是主语了，就变成一封信走进房间了。

因为选A的话句子缺少主语

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