单项选择;从A、B、C、D四个选项中选出一个可以填入句中空白处的最佳答案。
Bell invented ______ telephone in 1876, which is_______ useful invention.
A. the, a B. a , a C. the, the D. a, the
A
Christopher Columbus _____ America while Edison ________ the light bulb.
A. invented, discovered B.invented, invented
C. discovered, discovered D.discovered, invented
D
I _______bought this kind of robot which sells well in China.
A. regret not to have B. regret to have
C. regret to having D. regret not having
D
--When will the railway that connects the two cities open?
--_______next year. Only two thirds _______been built.
A. Until; has B. Until; have
C. Not until; has D. Not until; have
C
India has ______ population in the world. There are over one ______ people living there.
A. the second large, billion B. the second large, billions
C. the second largest, billions of D. the second largest, billion
D
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