单项选择题

There is nothing to do but ______ the experiment.

A．to repeat
B．repeating
C．repeats
D．repeat
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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
单项选择题
Poor ______ he is, he remains honest and kind.
A．as
B．however
C．because
D．although
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