this room is( )that one.选错的 为什么?A,three times so big as B,three times the size of C,three times bigger than D,a third as big as

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this room is( )that one.选错的 为什么?
A,three times so big as B,three times the size of C,three times bigger than D,a third as big as

A
比较级:
倍数+the size of ;
主语+谓语(系动词)+ 形容词比较级+than+ 对比成分;
倍数+as+adj/adv+as或not so(as)+adj/adv+as(比较级的否定形式才有用到so);

选D,因为,三倍是 three times 毫无疑问
a third 在这里意思是,一个第三,那么整句的意思是这个房间和那个房间作为第三一样大。

A
别的用法都需要背下来