— What about the price of petrol now?
— It has been ______ 20 percent since the beginning of this year.
A．increased toB．risen byC．increased byD．risen to
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)。
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