单项选择题
I knocked at the door several times __________ an elderly lady came to answer it.
A．before
B．after
C． unless
D．then
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单项选择题
I __________ a doctor now, if I had studied medical science in my youth.
A．were
B．should be
C．had been
D．should have been
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单项选择题
Not only __________ our money, but we were also in danger of losing our lives.
A． we lost
B．lost we
C．did we lose
D．we did lose
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