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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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
单项选择题
Would you please __________ the text until you have finished the exercise
A．not to refer to
B．don’t refer to
C．not refer to
D．doesn’t refer to
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