Before traveling in space, you must know what it might feel like_____in an imaginary environment.
A.to travel
B.traveling
C.to be traveling
D.travel
网友回答
A解析本题易受到feel like doing sth的影响而误选B, 此处feel like的意思为 “感觉象什么”, it 为形式主语,真正的主语为不定式短语。句意：太空旅行前，你必须知道在模拟环境下行走时的感觉。