问题描述：
--Jack,you are weak in English.You must work har
--Jack,you are weak in English.You must work hard.--I see.I believe I will （ ） learn English well soon.A.can B.could C.be able to D.have to
--Jack,you are weak in English.You must work hard.--I see.I believe I will （ ） learn English well soon.A.can B.could C.be able to D.have to
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