Question

第七道英文题

The output of our factory is now three times ( ) it was three yeas ago.
A.what B.that C.as D.which
答案是A，为什么？
为什么不能选C

Answer 1

同位语从句，now three times 是短语作表语，what it was three yeas ago从迟裂带句作源桐表语。what it was three yeas ago.这句话中it做形式主语，真码芦正的主语是what代替的output

Answer 2

比较的是产品

我们工厂现在的产品是三年前的三倍。