单项选择题

I wish I ______ able to help you. But the problem is that I am too busy to spare even one minute.

A．am
B．will be
C．were
D．shall be
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He won't leave until she ______ back.
A．came
B．comes
C．come
D．coming
单项选择题
It ______ every day so far this week.
A．rains
B．mined
C．has mined
D．was mining
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