单项选择题

Children who stay away from school do_______for different reasons.

A．them
B．/
C．it
D．theirs
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单项选择题
He asked me to lend him some money, which I agreed to do, _______that he paid me back the following week.
A．on occasion
B．on purpose
C．on condition
D．only if
单项选择题
_______you_______further problems with your printer, contact your dealer for advice.
A．If, had
B．Have, had
C．Should, have
D．In case, had
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