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