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
-- Don't say anything. -- ______I would.
A．If only
B．As if
C．As long as
D．So as to
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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