单项选择题

He hasn't decided ______ mathematics or physics.

A．whether to study
B．if to study
C．whether studying
D．whether studied
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I wonder whether the payment will be made ______ dollars.
A．in
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C．through
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Frankly speaking, I'd rather you ______ anything about it for the time being.
A．didn't do
B．haven't done
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