21. He told ______ lie to his friends that he was heavily in _______ debt because he wanted to borrow some money from them.
A. a; the B. a; a C. 不填；the D. a; 不填
22. — You look tired!
— Yeah, I ________ since 4 o’clock.
A. had played B. have been playing C. am playing D. have been played
