单项选择题

The children should learn to do some washing by ______.

A． they
B． them
C． themselves
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单项选择题
I hear ______ they will come back from Guangzhou in two weeks.
A． that
B． when
C． what
单项选择题
I was listening to the radio ______. I heard a knock at the door.
A． while
B． when
C． as
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