— What about the price of petrol now? — It has been 20 percent since the beginning of thi

问题补充：

— What about the price of petrol now?

— It has been 20 percent since the beginning of this year.

A. increased to

B. risen by

C. increased by

D. risen to

答案：

A. increased to

B. risen by

C. increased by

D. risen to

解析：increase ... by表示“增长了……”，要用被动语态，by表幅度；如果用rise，要用主动语态。