C. being exposed

　　D. having exposed

　　21. Steve Job’s success in the digital field proved _________ it took to become a best CEO.

　　A. what

　　B. which

　　C. that

　　D. how

　　22. My favorite book of all, ________ that really left a deep impression on me, was Game of Thrones by American writer George RR Martin.

　　A. one

　　B. the one

　　C. it

　　D. which

　　23. —May I go to play football with Dick now, Dad?

　　—No, you can’t go out ________ your work has not been done.

　　A. before

　　B. until

　　C. after

　　D. as

　　24. —Did you have a wonderful time at the concert last night?

　　— ________! I’ve never had a more wonderful time all my life.

　　A. You bet

　　B. No problem

　　C. Don’t mention it

　　D. Got it

　　25. —I saw Mr. Black on the playground this morning.

　　—You ________. He’s still on holiday in Sanya.

　　A. can’t

　　B. couldn’t have

　　C. mustn’t have

　　D. needn’t

　　【参考答案】单项选择11-15 BADDB

　　16-20 DBABC

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