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。