单项选择题

A．Sorry. I Can’t tell you.
B．Good. You have missed it.
C．Well, it has been delayed.
D．OK. Here you are.
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单项选择题
A．Hold on a second, please.B．Sorry, Dr. Li is not available right now.C．I am not sure.D．Thank you very much for calling.
A．Hold on a second, please.
B．Sorry, Dr. Li is not available right now.
C．I am not sure.
D．Thank you very much for calling.
单项选择题
______ were the people who first used umbrellas.
A．Chinese
B．Romans
C．Greeks
D．Egyptians
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