The price of oil is increasing so rapidly.
Indeed ! The oil prices____by 10 and 20 percent so far.
A． increasedB． increaseC． had increasedD． have increased
D
考察時(shí)態(tài)。根據(jù)時(shí)間狀語(yǔ)so far可知，本題使用現(xiàn)在完成時(shí)。故D正確。
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