问题
选择题
If their marketing plans succeed，they ________ their sales by 20 percent.
A．will increase
B．have been increasing
C．have increased
D．would be increasing
答案
答案：A
句意：要是他们的市场计划成功了，他们将增加20%的销售额。从句是一般现在时表将来，主句常用一般将来时或情态动词can/may＋动词原形。