单项选择题

We'll let you use the room（）you keep it clean and tidy.（）

A．as long as
B．on condition (that)
C．suppose
D．if

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单项选择题

I'm sorry I can't see you immediately; but if you'd like to take a seat, I'll be with you（）

A．for a moment
B．in a moment
C．for the moment
D．at the moment

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