单项选择题

To make matter worse, dirty jeans are the ideal place for germs, which ________ poor health.

A．contribute to
B．convert to
C．cope with
D．count for
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单项选择题
He will pass two milestones ________, that is, he will receive his master's degree and find a challenging job.
A．long before
B．before long
C．a long long ago
D．long ago
单项选择题
Nancy hasn't begun working on her Ph.D ________ working on her master's.
A．still because she is yet
B．yet as a result she is still
C．yet because she is still
D．still while she is already
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