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單項選擇題

---- I do apologize for knocking you down. ----（）

A.No, I’m perfectly all right.
B.You’re all right.
C.Don’t worry about it.
D.Not at all. Thank you

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The world's supplies of copper（）

A.have gradually being exhausted
B.are gradually exhausted
C.has been gradually exhausted
D.are being gradually exhausted

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— Would you mind closing the window? —（）.

A.Yes, please
B.No, I’m sorry
C.Certainly not
D.All right

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