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北京市2017届高三综合练习 英语 本试卷分第Ⅰ卷（选择题）和第Ⅱ卷（非选择题）两部分，共150分，考试时间120分钟。 第Ⅰ卷 （选择题 共115分） 注意事项： 1.答第Ⅰ卷前，考生务必将自己的姓名、准考证号、考试科目涂写在答题卡上。 2.每小题选出答案后，用铅笔把答题卡上对应题目的答案标号涂黑。如需改动，用橡皮擦干净后，再选涂其他答案标号。 二、单项填空（共15小题，每小题1分，满分15分） 21.—I have got a pain in my back. —No wonder. You ______ in front of the computer too long. A. have worked B. are working C. have been working D. Worked 22. —Did you reach the top of the mountain? —Yes. Even I myself didn’t believe I could make ______. A. that B. it C. one D. any 23. I don’t think the experiment is ______ failure. At least we have gained ______ experience for future success. A.不填；the B. a; the C. a ; 不填 D.不填; 不填 — Why didn’t you help the little boy? | 
