单项选择题

We don't know ______ . If she, I'll left you know.

A．if she comes; will come
B．if she will come; comes
C．whether she comes; comes
D．whether she will come; will come

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单项选择题

I don't think he ______ now.

A．must sleep
B．must be sleeping
C．can be sleeping
D．may sleep

单项选择题

Can you tell me the difference ______ these three words

A．between
B．among
C．of
D．with

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