单项选择题

At 13 he was sent to a shop, ______ he learned the business.

A．where
B．which
C．when
D．that
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单项选择题
You don't have to drive him home. He ______ already.
A．leaves
B．is leaving
C．has left
D．had left
单项选择题
Have you got any idea for the summer vacation I don't mind where we go ______ there's sun, sea and beach.
A．as if
B．as long as
C．now that
D．if only
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