单项选择题

I'm sure he'll do all he can ______.

[A] for help
[B] to help
[C] for helping
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单项选择题
—Is John at home now —Yes, I think ______.
[A] so
[B] right
[C] too
单项选择题
Nobody but Jane ______ Sam's address.
[A] know
[B] is known
[C] knows
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