There were _____ guests as chairs in the lecture hall.

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There were _____ guests as chairs in the lecture hall.
A.so many B.twice so many
C.twice D.twice as many
凭语感我能选出来答案是 C ,但是我需要解释给别人听,A,B,D 为什么不对么?
对对，是选我把答案看错了，那为什么是 D 该怎么解释其他几个是错的呢？

应该选：D.twice as many
这道题考的是倍数的表达方法之一：
倍数的表达方式有三种
1.倍数+as+形容词原级（有时形容词后面还跟名词）+as+比较对象
twice as many guests as chairs in the lecture hall.
倍数+ as+ 形容词原级（有时加名词）+ as+ 比较对象
你的这道题考的就是这种结构
这种结构中as不能用so来替换；它的词序不能改动.
再举一例：
This room is three times as large as that one.
2.倍数+形容词比较级+than+比较对象
This room is three times larger than that one.
3.倍数+the+名词+of短语
This room is three times the size of that one.

There were _____ guests as chairs in the lecture hall. There were some chairs left over _____ all the guests had sa As there were not enough chairs in the park ,they had to sit As there were not enough chairs in the park,they had to sit They were having a meeting in the lecture hall when the door There are some chairs and desks in the school hall.(改成否定句） There were about nine hundred people in the meeting hall. The beds and chairs were fairly _____ . 英语翻译there ,Let us go into the lecture hall.(go) 13.The foreign guests,_____ were scientists,were warmly welc air/were/the/there/in/chairs（连词成句）怎么做? There are not enough seats for the guests.We need chairs. A