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—What is the price of petrol these days?  —Oh,it ________ sharply since last month.
A.is raisedB.has risenC.has arisenD.is increased
B

试题分析:考查时态。本题的关键词是后面的since last month,连词since要与现在完成时连用。动词rise上升,上涨;arise不是出现;句意:—这些日子汽油的价格怎么样?—自从上个月以来汽油涨得很快!根据句意说明B正确。
点评:时态题的考查关键是抓住句子的上下文含义和句中的时间状语。要根据时间状语来选择合适的时态,在平时的学习中要注意积累有关时态的用法和各种时态的特殊之处。如since, so far等经常与现在完成时连用。在条件状语从句中用一般现在时代替将来时等等。
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