单项选择题

He tried to cope with the ever-increasing burden of his work, but finally he ________and had to take a complete rest.

A．broke through
B．broke out
C．broke into
D．broke down
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The English teacher focuses his teaching ________on improving students' listening and speaking ability.
A．remarkably
B．instantly
C．exclusively
D．initially
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One of the four police officers injured in the explosion has been ________from hospital.
A．relieved
B．loosened
C．restrained
D．released
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