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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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
单项选择题
He ______the Party ______ 1980.
A. has joined; in
B. has joined; since
C. joined; on
D. joined; in
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