单项选择题

When he bent down to tie his shoelace, the belt of his trousers ________.

A．ruined
B．cracked
C．broke
D．split
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My brother has decided to become a policeman, ________ what may.
A．came
B．come
C．coming
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单项选择题
Not until three years ago ________ to work outside.
A．he began
B．he begins
C．began he
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