Question

Prices are always rising these days. Up to now, the petrol price _______ 20%.

A．increased by	B．increased to
C．has increased to	D．has increased by

Answer 1

D

试题分析：考查时态和介词：时间是Up to now,时态是现在完成时，句意：价格最近一直在上升，到现在为止，石油价格已经上升了20%。Increase by上升了。选D。
点评：试题的考查要根据上下文的语境和句子中的关键词。本题就是根据上下文的语境来进行辨析的。还有介词by，可以表示相差了，reduce by减少了。