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

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

选项 A、keeps
B、has kept
C、keep
D、was kept

答案C

解析本题考查主谓一致，主语是the astronauts，所以谓语用复数。登上宇宙飞船的宇航员们在巨大圆形房间的天花板上绕圈跑步，以保持体形。

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