In September 2008,China’s key milestone in space travel when Zhai Zhigang conducted the f

发布时间：2020-08-15 01:14:21

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
B. was reached
C. has reached
D. had been reached
解析：   考查时态、语态。依据时间状语in September 2008可知，该处应用过去时，排除C项。翟志刚的太空行走与这一里程碑意义的目标的实现是几乎同时发生的动作，因此D项错误；而reach一词又与句子的主语milestone存在着动宾关系，所以应用被动语态，因此B项正确。
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