The output of our factory is now twice______it was three years ago.

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问题 The output of our factory is now twice______it was three years ago.

选项 A、what
B、that
C、as
D、which

答案A

解析 倍数的表达方式可以是倍数+名词,此句中,名词是一个由what引导的名词从句,what是从句的表语,故选A。
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