◎ 题干
_____ their final medical check, the astronauts boarded their spacecraft.

[     ]

A. Received
B. Being received
C. To receive
D. Having received
◎ 答案
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“_____ their final medical check, the astronauts boarded their spacecraft. [ ]A. Received B. Being received C. To receive D. Having received …”主要考查了你对  【现在分词的完成式】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。