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问题: 英语问题

Output of coal in this area this year is six
times ______ it was before 1997.
A.for which B.what C.of that D.that
请给出正确答案并解释,谢谢

解答:

Cof that ..."that"直接指代一个词.这里是一个句子.可排除.
AD为引导定语从句的引导词,这里不是定语从句.可排除.
选B
这个地方的煤产量是1997年之前的六倍.
估计您没看明白.
给您补充吧:整个句子可还原为: Output of coal in this area this year is six times than what it was before 1997.
"what"
充当表语.