Since advertising can increase sales of production, it can the price.
A. so; reduced
B. so; reduce
C. /; be reduced
D. / ; reduce
网友回答
A. so; reduced
B. so; reduce
C. /; be reduced
(答案→)D. / ; reduce
解析：since ‘“因为”和because 一样，不能和so连用。 Can情态动词后跟动词原形。“因为做广告能提高销售量，它能降低成本”