Computers can work out maths problems ____ than we do.
A)much quickly B)more quick C)even quicker D)far more quickly
When I got to the station,the train ____already.
A)had left B)has left
当他到站了,发现包掉在车上是用leave还是forget?
It _____ too much.
A)spends B)takes C)costs D)pays