问题标题：
【ItisthefirsttimethatChineseastronautWangYue________asoneofthevolunteersfortheMars-500testproject.A．hasbeenselectedB．hadbeenselectedC．hasselectedD．selected】
问题描述：
ItisthefirsttimethatChineseastronautWangYue________asoneofthevolunteersfortheMars-500testproject. | |||
| A．hasbeenselected | B．hadbeenselected | C．hasselected | D．selected |
甘丹回答：
A
考查句型：Itisthefirsttimethat后跟从句用现在完成时态，根据语境中国的宇航演员王跃被选为，所以应用现在完成时的被动语态，谓语动词用单数，选A。
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