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II．语法单项填空。(共25小题；每小题1分，满分25分)
从A、B、C、D四个选项中，选出可以填人空白处的最佳选项，并在答题卡上将该项涂黑。
21. -Nothing wrong with it, _______?
-Yes.The computer says: “Please format this disk before entering data.”
A. does it B. isn’t it C. isn’t there D. is there
22. The unemployment rate in western cities _______ from 6% to 3% in the past two years.
从A、B、C、D四个选项中，选出可以填人空白处的最佳选项，并在答题卡上将该项涂黑。
21. -Nothing wrong with it, _______?
-Yes.The computer says: “Please format this disk before entering data.”
A. does it B. isn’t it C. isn’t there D. is there
22. The unemployment rate in western cities _______ from 6% to 3% in the past two years.
