单项选择题

We booked rooms at the hotel ______ we should find no vacancies on our arrival.

A．if
B．lest
C．since
D．whenever
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Medical care reform has become this country's most important public health ______.
A．question
B．stuff
C．matter
D．issue
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Mr. Smith said that he would be punctual for the appointment, ______ he were late
A．but what if
B．how about
C．and what about
D．so what
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