—I guess you can buy such a smart phone for 300 dollars.
—I could just two months ago，but the price ________ by 20%.
A．went upB．had gone up
C．has gone upD．goes up
C
考查動詞的時態(tài)。根據(jù)語境可知，此處是說該款智能手機到目前為止價格已上漲20%，因此用現(xiàn)在完成時。
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