Question

— 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

Answer 1

7. C

 increase ... by表示“增長了……”，要用被動語態(tài)，by表幅度；如果用rise，要用主動語態(tài)。