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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