单项选择题

I know that you are extremely busy, so I won't ______ any more of your time.

A．bother
B．spend
C．waste
D．cost
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单项选择题
Perhaps you ______ leave now. Your friend may be waiting for you outside.
A．must
B．could
C．should
D．will
单项选择题
When we met Mr. Smith last year, he ______ in that school for ten years.
A．taught
B．was teaching
C．had taught
D．would teach
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