单项选择题

I have kept that picture ______ I can see it clearly, as it always reminds me of my university days.

A．which
B．where
C．whether
D．when
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单项选择题
In this private school, a dentist ______ the pupils' teeth twice a week.
A．injures
B．instructs
C．inspects
D．informs
单项选择题
We congratulate you ______ the success you have got.
A．by
B．for
C．on
D．with
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