单项选择题

______ did you finish your work—Three hours ago.

A． How
B． Why
C． When
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单项选择题
Why can’t many stars be seen
A． They are too small.
B． They are too bright.
C． They are too far away.
单项选择题
How long has the man been a party member
A． Two years.
B． One year.
C． Less than a year.
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