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II.单项选择（每题1分，共20分）
11. _______of the truth of the reports, he told his colleagues about it.
A. Convincing B. Convinced C. To convince D. Having convinced
12. The __________of your house is clean now.
A. environment B. circumstance C. surrounding D. surroundings
13. On AIDS Day this year, President Hu Jintao demanded that the problems _____paid special attention to.
11. _______of the truth of the reports, he told his colleagues about it.
A. Convincing B. Convinced C. To convince D. Having convinced
12. The __________of your house is clean now.
A. environment B. circumstance C. surrounding D. surroundings
13. On AIDS Day this year, President Hu Jintao demanded that the problems _____paid special attention to.
