单项选择题

The teacher told us that the earth ______ round.

A. was
B. had been
C. has been
D. is
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单项选择题
Mr Black ______ to my parents when I saw him a moment ago.
A. talks
B. has talked
C. was talking
D. is talking
单项选择题
There is too much snow these days. It ______ for a few days.
A. was snowing
B. has been snowing
C. had been snowing
D. snowed
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