题干

Shenzhou-VIII has docked with Tiangong-I successfully, ________ the start of the establishment of China’s own space station.
A.markedB.to markC.markingD.having marked
上一题 下一题 0.64难度 单项选择 更新时间:2013-05-19 01:57:07

答案(点此获取答案解析)