In September 2008,China’s key milestone in space travel _____when Zhai Zhigang
conducted the first space walk.?
A．reachedB．was reached?
C．has reachedD．had been reached?
 B
   考查時(shí)態(tài)、語(yǔ)態(tài)。依據(jù)時(shí)間狀語(yǔ)in September 2008可知，該處應(yīng)用過(guò)去時(shí)，排除C項(xiàng)。翟志剛的太空行走與這一里程碑意義的目標(biāo)的實(shí)現(xiàn)是幾乎同時(shí)發(fā)生的動(dòng)作，因此D項(xiàng)錯(cuò)誤；而reach一詞又與句子的主語(yǔ)milestone存在著動(dòng)賓關(guān)系，所以應(yīng)用被動(dòng)語(yǔ)態(tài)，因此B項(xiàng)正確。
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