单项选择题

Let me take this ________ to thank you publicly for all you have done for our company.

A．occasion
B．chance
C．opportunity
D．occurrence
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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
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
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