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
The manager needs an assistant that he can ______to take care of problems in his absence.
A．count on
B．count in
C．count up
D．count out
单项选择题
They always give the available seats to______ comes first.
A．whoever
B．whomever
C．whichever
D．whom
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