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

Helen looked at the finished painting with （）

A.satisfaction
B.success
C.victory
D.favour

单项选择题

-- Please don't tell anybody. -- I （）I promise.

A.can't
B.don't
C.won't
D.mustn't

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