he is working hard for fear that he ___ A should fall behind

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he is working hard for fear that he ___ A should fall behind B would fall behind
为什么答案选A
我觉得应该选B 意思是可能会落后,这个should怎么解释?

should 作为情态动词,用在由 so that,for fear that,lest 引导的目的状语从句和 in case （that）引导的条件状语从句中,有“能够”、“可能”、“会”之意.例如：
They got up early so that they should （= could/ might） 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.

he is working hard for fear that he ___ A should fall behind He’s working hard for fear that he_____________ .A.should fa he is working hard for fear that he_______. 1.He's working hard ____ he should fall behind. He's working hard for fear that he ____. He is worked hard for fear that he. 1.It is not death that a man should fear ,but he should fear He is working hard people 对working he is working for a big firm? He is really hard-working,is not he?A.Yes,he does.B.Yes,he i he may fall behind ___ students when he comes back.A other B — He is a very hard-working student．