单项选择题

I heard somebody ______ at the door.

A．knocked
B．to knock
C．knock
D．knocking
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单项选择题
My brother's room is ______ mine.

A．twice the size of
B．as twice the size
C．as twice as
D．twice the size as
单项选择题
What dose the author probably do（）

A．A historian.
B．A government officer.
C．A sociologist.
D．An Educator.
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