21.【2012·西安一次质检】He was poorest man here years ago, but now he is rich man.
A．a; the B．不填; the C．the; a D．不填; a
22.【2012四川卷】—Did you catch what I said?
—Sorry. I ______ a text message just now.
A. had answering B. have answered C. would answer D. was answering
