After a 68-hour flight in the Shenzhou VII spaceship three astronauts Zhai zhigang Liu B

问题补充：

After a 68-hour flight in the Shenzhou VII spaceship, three astronauts Zhai zhigang, Liu Boming and Jing Haipeng returned to the earth .

A. safely and soundly

B. safe and sound

C. safely and sound

D. safe and soundless

答案：

A. safely and soundly

(答案→)B. safe and sound

C. safely and sound

D. safe and soundless

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