单项选择题

She had three sons,（）were doctors.

A．whom
B．who
C．which
D．that

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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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