.The price of petrol has been ______ 20 percent since the be

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.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

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 increased to 20%意思是“被增加到20%”,而been increased by 20%意思是“被增加了20%”,很明显用by不用to.
所以正确答案为C.

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