单项选择题

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

A．when
B．which
C．where
D．that
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单项选择题
It's a long time since he left England,______
A．didn't he
B．hadn't he
C．wasn't it
D．isn't it
单项选择题
I am looking forward to______ from you as soon as possible.
A．hear
B．be hearing
C．hearing
D．have heard
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