问题
选择题
----- 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
答案
答案:B
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。