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
When he just got off the plane, he gave us a good description of （） in Afric

A. what he had seen
B. that he had seen
C. which he had seen
D. he had seen what
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