单项选择题

All but one ______ here just now.

A. is
B. was
C. has been
D. were
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单项选择题
The teacher told us that the earth ______ round.
A. was
B. had been
C. has been
D. is
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
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