问题
选择题
—What is the price of gas these days? —Oh, it ____________ sharply since last month.
A．is rising
B．has risen
C．is arising
D．has arisen
答案
答案：B
本题考查时态和动词辨义。since+过去时间作状语，句子常用现在完成时。rise上升；arise产生；出现。
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