从a、b、c、d四个选项中,选出可以填入空白处的最佳选项,并在答题卡上将该选项涂黑。 21. it is really ______useful dictionary, ______dictionary every one of us needs. a. an; a b. a; the c. the; a d. a; a 22. —i’m sorry; i shouldn’t have been so rude to you. —you ______ something not very nice to me, but that’s ok. a. have said b. had said c. were saying d. did say 23. so convenient ______ to pay by credit card that more and more people apply for their credit cards. a. do people find b. people find it c. find people d. do people find it 24. the living room is clean and tidy, with a dining table already ______ for a meal to be cooked. a. laid b. laying c. to lay d. being laid 25. —do you know where the headmaster is? i have something urgent. —oh, he ______ have gone far, for the computer is still on in the office. a. won’t b. mustn’t c. can’t d. wouldn’t