问题
选择题
20. _________raining hard for 3 hours without stopping.
21.
A．It is
B．It was
C．It has been
D．It had been
答案
答案：C
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20. _________raining hard for 3 hours without stopping.
21.
A．It is
B．It was
C．It has been
D．It had been
答案：C