问题
选择题
The production of the factory has grown to _____ in 1999.
A．twice as it was
B．twice what it was
C．as twice as it was
D．twice that it was
答案
答案：B
题目分析：介词to后接一个有关倍数的宾语从句，其结构为：倍数+what it is，what 在从句中做表语，因为一般表示多少倍都是修饰主语，为主+be+表的结构，故选B。