.If their marketing plans succeed, they their sales by 30 percent.A. will increaseB. have

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(答案→)A. will increase
B. have been increasing
C. have increased
D. would be increasing
解析：考查if引导条件状语从句的用法。主句用一般将来时，从句用一般现在时表将来。句意：如果他们的营销计划成功的话，他们的销售额会增加30%。