21． The scenery in the northwest, with its rolling mountains and plains, is quite different from ．of the seaside city, Dalian
A．the one B．one C．it D．that
22．— Nice to see you again after all these years． What ?
—Well, I've tried many things since we left school． I'm now working for a large oil company．
A． have you done B． were you doing
C． have you been doing D． did you do
