单项选择题

I __________ you how to do it; why didn’t you ask me

A．could show
B．would show
C．could have shown
D．showed
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单项选择题
__________ is not known if he will come.
A．That
B．This
C．What
D．It
单项选择题
Let me tell you what to do next __________ I forget.
A．unless
B．th
C．before
D．if
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