问题
选择题
_________ their final medical check, the astronauts boarded their spacecraft.
A．Received
B．Being received
C．To receive
D．Having received
答案
答案：D
考查非谓语动词。接受体格检查再等上航天飞机之前，且主语与动作之间是主动关系，故需要用现在分词的完成式。
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