Mr.White is now in Beijing and runs a company in Zhongguancun together with some Chinese

问题补充：

Mr.White is now in Beijing and runs a company in Zhongguancun together with some Chinese friends.

A. to base

B. basing

C. to be based

D. based

答案：

A. to base

B. basing

C. to be based

(答案→)D. based

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