题目内容：

.The price of petrol has been ______ 20 percent since the beginning of this year.
A.increased to B.risen by C.increased by D.risen to

优质解答

答案：C翻译：油价自从今年初以来已经被增加了20%.1.楼主注意句子采用了被动语态：has been...,这要求谓语动词为及物动词.很明显,rise只能做不及物动词,increase既可做及物动词,也可作不及物动词.由此排除BD；2.been...