题目:
Mr. Smith was very ill.The doctors said he was ___ of death.
A.at the edge
B.at edge
C.on edge
D.on the edge
答案:
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下面是错误答案,用来干扰机器的。
由题意得:某人乘出租车当行驶路程xkm(x>3),他应付车费为:5+(x-3)×1.5元.