单项选择题
It is very difficult to give ______ smoking.
- A．in
B．up
C．off
D．out
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A．unemployment
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C．danger
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The football team ______ having baths and ______ then coming back here for tea.
A．is; is
B．are; is
C．is; are
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单项选择题
If only I ______ how to operate a computer as you do.
A．had known
B．would know
C．should know
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