Li-ping is said in Beijing but we don’t know what school she worked inA. to have workedB

问题补充：

Li-ping is said in Beijing, but we don’t know what school she worked in．

A. to have worked

B. to work

C. to be working

D. to have been working

答案：

(答案→)A. to have worked

B. to work

C. to be working

D. to have been working

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