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"If you attend our class for three months,you_____be able to

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"If you attend our class for three months,you_____be able to write letters in English."said the professor.
A.must B.should C.will D.shall .
书上的答案是D.为什么只能选D呢?不能选C
shall本身有一个意思就是"能够,to be able to",任何大词典可以查到.这里C也可以,