In September2008,China's key milestone in space travel( )when Zhai Zhigang conducted the(见下方）first spacewalkA.reached B.was reached C.has reached D.had been reached该题正确答案应选B,说明其他几项为什么不对,

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In September2008,China's key milestone in space travel( )when Zhai Zhigang conducted the(见下方）
first spacewalk
A.reached B.was reached C.has reached D.had been reached
该题正确答案应选B,说明其他几项为什么不对,

1.首先应该用被动语态,所以A,C排除；
2.由于时间是2008年9月,用一般过去时态就可以了,不用过去完成时态.所以D不对.

reach是及物动词,这里后面没有出现宾语,显然是用了被动语态.a和c排除,d时态和语句意思不符,选b

里程碑被人们reach达到了，，被动。。。不用AC
when表示某个时间，所以不用D 完成时

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