单项选择题

I don't know ______ I can come or not.

A．whether
B．if
C．that
D．what
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单项选择题
They were all very tired, but ______ of them would stop to take a rest.
A．any
B．some
C．none
D．neither
单项选择题
It'd be helpful ______ me ______ know what your plans for the week are.
A．to... for
B．for... by
C．for... to
D．to... through
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