单项选择题

—John，why did you make no reply to me when I called you in the street —Sorry,Jim.Ito my friend on the phone.

A．was talking
B．talked
C．am talking
D．had talked
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单项选择题
Generally speaking，the air pollution in cities is more serious thanin the country.
A． ones
B．one
C．that
D．those
单项选择题
China is planning to buildnew station inSouth Pole for scientific research in 5—15 years time.
A． the；the
B． a；the
C．the；不填
D．a；不填
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