847.Nowadays,a graduate with a master's degree _______ fail to find a high-paying job,which discourages a lot of college students.

A.shall
B.can
C.will
D.must

848.Not every prisoner can travel,and we have strict and fair regulations.Those selected ______ have performed well in the prison and are going to be released soon.

A.could
B.might
C.must
D.should

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