Our city has developed into a big city which isit used to be.A. four times larger than th

问题补充：

Our city has developed into a big city,which isit used to be.

A. four times larger than that

B. four times the size of what

C. four times the size larger than what

D. as four times the size as that

答案：

A. four times larger than that

(答案→)B. four times the size of what

C. four times the size larger than what

D. as four times the size as that

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