问题
选择题
Astronaut Zhai Zhigang has become the first Chinese_______in space.
A．walking
B．walked
C．to have walked
D．to walk
答案
答案：D
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Astronaut Zhai Zhigang has become the first Chinese_______in space.
A．walking
B．walked
C．to have walked
D．to walk
答案：D