单项选择
21. In most countries, a university degree can give you flying start in life.
A. the; a B. the; 不填 C.不填; 不填 D.不填; a
22. —Why, Jack, you look so fired!
—Well, I the house and I must finish the work tomorrow.
A. was painting B. will be painting C. have painted D. have been painting
23. —I haven’t got the reference book yet, but I’ll have a test on the subject next month.
—Don’t worry. You have it by Friday.
A. could B. shall C. must D. may
