单项选择题

__________ is not known if he will come.

A．That
B．This
C．What
D．It
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单项选择题
Let me tell you what to do next __________ I forget.
A．unless
B．th
C．before
D．if
单项选择题
I wish I could go with you on the trip, but I __________ no time.
A．have
B．had
C．have had
D．had had
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