The astronauts on board the spaceship______ in shape by running around the ceiling of a hu

外语类 专四 已帮助 人

The astronauts on board the spaceship______ in shape by running around the ceiling of a huge circular room.

A.keeps

B.has kept

C.keep

D.was kept

请帮忙给出正确答案和分析,谢谢!

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