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22.You_________buy some reference books when you go to colle

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22.You_________buy some reference books when you go to college.
22.You buy some reference books when you go to college.
A.could B.will have to
C.must to D.might
这是一句将来时,所以要选B了,不能选A,D,must后要跟动词原形,不可以加to,最后只能B对了,意思是当你上大学时,不得不买些参考书!