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He will go to America next month,if he ____ready then.A.is B.will be C.shall be D.is going to be 并说明理由.

题目详情
He will go to America next month,if he ____ready then.
A.is B.will be C.shall be D.is going to be
并说明理由.
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答案和解析
A
if引导条件句,将来时用现在时代替