网易推广员不能领号了:一个英语选择!

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Output is now six times _______ it was before 1990.
A.that B. what C. for which D.of that
选B,为什么呢?什么结构呀 ,谢谢了,

what,意思是:比1990年的产值多6。

for which

that.
It was six times before 1990.
six times

what
状语从句