Question

Since taxi fare in the city may run ________ twenty dollars, I suggest that you take a bus.

1. A.
   as high as
2. B.
   as expensive as
3. C.
   so high as
4. D.
   so expensive as

Answer 1

A
首先要表示价格多达 20美元，只能用high，而不能用expensive，expensive只能用在说明某样东西是贵还是便宜．而且要表达“多达……”的时候，要用as+形容词+as…；否定句中才能用(not)so+形容词+as…．