单项选择题

He talks as if he ______ everything.

A．knows
B．has known
C．knew
D．will know
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Mother does most of ______ at home.
A．clean
B．cleaning
C．to clean
D．the cleaning
单项选择题
I have no one ______ I can talk upon such matters.
A．to whom
B．whom
C．who
D．that
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