单项选择题

She used to（）her teaching when she was young.

A．devote
B．be devoted to
C．devoting to
D．being devoted to

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单项选择题
By the time I come back from my holidays, you（）your paper.

A．will have finished
B．will be finished
C．would finish
D．have finished
单项选择题
Hardly（）when a loud explosion was heard.

A．the train had started
B．the train had been started
C．had the train started
D．the train started
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