题目内容

_________ their final medical check, the astronauts boarded their spacecraft.
A．ReceivedB．Being receivedC．To receiveD．Having received
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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