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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单项选择题
The opening ceremony is a great occasion. It is essential _______for that.
A．for us to be prepared
B．that we are prepared
C．of us to be prepared
D．our being prepared
单项选择题
Care should be taken to decrease the length of time that one is ______loud continuous noise.
A．subjected to
B．filled with
C．associated with
D．attached to
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