图书馆管理专业分数线:谁来帮我做?英语介词填空

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二.介词填空:
11.Don’t laugh _______ people when they are in trouble.
12. He looked ________ the clock to see what time it was.
13. He does not like to speak ___________ public.
14. My brother is _______ great trouble about his studies.
15. He is thinking ____ going to England.
16. Did you heard __________ his accident?

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