答案是c。
21. ---look! the telephone is broken. someone damaged it ________ purpose.
---that may be right. but perhaps it was broken _________ accident.
a. on; by b. by; by c. on; on d. by; on
22．a ______ person always tries to finish the job, no matter how hard it is.
a. stubborn b. determined c. reliable d. remarkable
23. was it in 2002 __________ he was still at middle school __________ the boy became expert at computer?
a. that; where b. when; where c. that; when d. when; that
24. --- mary had a traffic accident and has been sent to the hospital. did you tell her boss about it?
--- yes, but i _____ her husband first.
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