—What is the price of gas these days?   —Oh, it ____________ sharply since last month.
A．is risingB．has risenC．is arisingD．has arisen
B
本題考查時(shí)態(tài)和動(dòng)詞辨義。since+過(guò)去時(shí)間作狀語(yǔ)，句子常用現(xiàn)在完成時(shí)。rise上升；arise產(chǎn)生；出現(xiàn)。
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