------- What is the price of petrol these days
-------Oh, it ______ sharply since last month.
A．is raisedB．has risenC．has arisenD．is increased
B  
本題考查時(shí)態(tài)的用法。根據(jù)since last month 可知應(yīng)用現(xiàn)在完成時(shí)。
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