_________ their final medical check, the astronauts boarded their spacecraft.
A．ReceivedB．Being receivedC．To receiveD．Having received
D
考查非謂語動詞。接受體格檢查再等上航天飛機之前，且主語與動作之間是主動關(guān)系，故需要用現(xiàn)在分詞的完成式。
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