单项选择题

They have worked in this workshop ______ ten years.

A． since
B． after
C． for
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单项选择题
—______ will you leave for Beijing—In a week.
A． How soon
B． How long
C． How often
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—Would you mind my opening the window
A． Yes, please
B． No, not at all
C． No, I mind
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