问题
选择题
—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 up
B．had gone up
C．has gone up
D．goes up
答案
答案：C
考查动词的时态。根据语境可知，此处是说该款智能手机到目前为止价格已上涨20%，因此用现在完成时。