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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单项选择题
After ______ for the job, as usual, you will be required to take a language test.
A．being interviewed
B．been interviewed
C．interviewing
D．having interviewing
单项选择题
I want you to come to the party but ______ you don't want to come, you don't have to.
A．while
B．before
C．unless
D．if
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