单项选择题

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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单项选择题

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

单项选择题

A.reflects
B.reflected
C.is reflected
D.is reflecting

单项选择题

A.have a pleasant journey
B.you’re so lucky to go abroad
C.wish you happy
D.good-bye