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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单项选择题

（）this, they formed a shock team to help complete the work.

A．Hearing of
B．Heard of
C．Hear of
D．Having been heard of

单项选择题

Mother does most of（）at home.

A．clean
B．cleaning
C．to clean
D．the cleaning

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