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问题: 英语选择1题

The output of the wheat in Chongming Country is three times ______ it was a decade ago.
A.as D.what

为什么不可以用as?

解答:

如果用as,那么it就应该去掉,我们说As is known to all,As is said above,As is often the case之类的,发现了没有,没有it,至于为什么...我不会说,知道是这样就对了.