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
—Today is my birthday. Can you come to my party tonight —______.
[A] Don’t worry.
B. Sure, I’d love to.
C. No,I don’t know.
单项选择题
Wash your hands ______ you eat something.
A. as

B. before
C. when
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