单项选择题

The doctor knew that he had not seen Henry before.

A． Right.
B． Wrong.
C． Doesn't say.
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单项选择题
Henry wanted to know how much it cost to go to the doctor.
A． Right.
B． Wrong.
C． Doesn't say.
单项选择题
Wash your hands ______ you eat something.
A． as
B． before
C． when
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