You’d better go there by train.The train ticket is the airplane ticket.A. as cheap three

问题补充：

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：

A. as cheap three times as

B. as three times cheap as

(答案→)C. three times cheaper than

D. cheaper three times than

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，由此可断C项正确，此处是“倍数词+比较级+than”结构。