21. What China can learn from 2008 financial storm has become hot topic among us.
A. the, 不填 B. the, a C. 不填, the D.不填, a
22. --Why' on earth didn't you answer the door?
--I'm sorry, but the phone too.
A. is ringing B. was ringing C. rang D. was about to ring
23. His inexperience__ into account, Jeffery shouldn't be charged with such a heavy task.
A. taking B. being taken C. to take D. taken
