单项选择题

Come and see me whenever_________.

A．you are convenient
B．you will be convenient
C．it is convenient to you
D．it will be convenient to you
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单项选择题
A．asB．howC．thatD．which
A．as
B．how
C．that
D．which
单项选择题
We shall probably never be able to ______ the exact nature of these sub-atomic particles.
A．assert
B．impart
C．ascertain
D．notify
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