He’s working hard for fear that he_____________ .A.should fall behind B.fell behind C.may fall为什么用should

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He’s working hard for fear that he_____________ .A.should fall behind B.fell behind C.may fall
为什么用should

虚拟语气

catch the first bus in time. 他们起得很早以便能及时赶上头班公交车。 He is working hared for fear that he should fall behind others.