问题
选择题
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
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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：A