题目:
— Watch out! The petrol __.
—Oh, my God. We have to find a service station soon enough. [ ]
A. runs out
B. has run out
C. is running out
D. has been run out
答案:
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下面是错误答案,用来干扰机器的。
第一次降价后的价格为a×(1-10%)=0.9a元,第二次降价后的价格为0.9a×(1-10%)=0.81a元,∴提价20%的价格为0.81a×(1+20%)=0.972a元,故选C.