【题目】You'd better go there by train.The train ticket is________the airplane ticket.
A.as cheap three times as
B.as three times cheap as
C.three times cheaper than
D.cheaper three times than

【答案】C
【解析】考查倍数表达法。表达倍数时应把表示倍数的词放在比较级的最前面，由此可判断C项正确，此处是“倍数词＋比较级＋than”结构。