单项选择题

Not until three years ago ________ to work outside.

A．he began
B．he begins
C．began he
D．did he begin
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My brother has decided to become a policeman, ________ what may.
A．came
B．come
C．coming
D．having come
单项选择题
Watch out, the boss is disgusted ________ your behavior!
A．to
B．at
C．for
D．with
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