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一. 语言知识 本题共有10个小题，请从每个小题的四个选项中，选出最佳答案。（共10题，计10分）
26. We _______ talk loudly when we see the sign “Be quiet” on the wall.
A. must B. mustn’t C. need D. needn’t
27. Why not________ your teacher for help when you can’t finish ________it by yourself?
A. ask, write B. to ask, writing C. ask, writing D. asking, write
26. We _______ talk loudly when we see the sign “Be quiet” on the wall.
A. must B. mustn’t C. need D. needn’t
27. Why not________ your teacher for help when you can’t finish ________it by yourself?
A. ask, write B. to ask, writing C. ask, writing D. asking, write
