their final medical check, the astronauts boarded their spacecraft．
A. Received
B. Being received
C. To receive
D. Having received
网友回答
A. Received
B. Being received
C. To receive
(答案→)D. Having received
解析：考查非谓语动词作状语。the astronauts 与receive 之间是主动关系，所以用现在分词，又知receive的动作发生在boarded之前，所以用现在分词的完成式，句意：收到最终的医疗检查之后，宇航员们登上了他们的宇宙飞船。所以选D。