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
Don't lose heart! You should ________ your courage and overcome the difficulty.
A．hold up
B．set up
C．pull up
D．pluck up
单项选择题
The gentleman ________ a cherub with his letter.
A．combined
B．included
C．kept
D．enclosed
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