. In September 2008 , China’s key milestone in space travelwhen Zhai Zhigang conducted the

发布时间：2020-08-16 11:23:59


. In September 2008 , China’s key milestone in space travel    when Zhai Zhigang conducted the first space walk.
A. reached
B. was reached
C. has reached
D. had been reached

网友回答

A. reached
(答案→)B. was reached
C. has reached
D. had been reached
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