The price of oil is increasing so rapidly.Indeed ! The oil pricesby 10 and 20 percent so f

问题补充：

The price of oil is increasing so rapidly.

Indeed ! The oil pricesby 10 and 20 percent so far.

Aincreased

Bincrease

Chad increased

Dhave increased

答案：

A. increased

B. increase

C. had increased

(答案→)D. have increased

解析：考察时态。根据时间状语so far可知，本题使用现在完成时。故D正确。