单项选择题

She had a tense expression on her face, ______ she were expecting trouble.

A．even though
B．now that
C．even as
D．as though
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单项选择题
Medical care reform has become this country's most important public health ______.
A．question
B．stuff
C．matter
D．issue
单项选择题
67（）

A．All at once
B．At once
C．Immediately
D．All suddenly
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