问题
选择题
.If their marketing plans succeed, they ____ their sales by 30 percent.
A．will increase
B．have been increasing
C．have increased
D．would be increasing
答案
答案：A
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%。
点评：f引导条件状语从句主句用一般将来时，从句用一般现在时表将来。