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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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
单项选择题
By the time of next year he ______ writing this novel.
A. will have finished
B. have had finished
C. will finished
D. has had finished
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