If our marketing plan succeeds, we the sales by thirty percent next year.A. would increas

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A. would increase
(答案→)B. will increase
C. would have increased
D. will be increasing
解析：如果我们的营销计划成功，我们明年销售将增加百分之三十。If条件句使用的是一般现在时代替一般将来时，所以主句也是一般将来时，和next year搭配使用。所以选B。