----- What is the price of petrol these days？
-----Oh, it sharply since last month.
A. is raised
B. has risen
C. has arisen
D. is increased
网友回答
A. is raised
(答案→)B. has risen
C. has arisen
D. is increased
解析：考查时态。Since引导的时间状语通常和现在完成时连用的。句意：自从上个月，汽油价格一直在上涨。