单项选择题

Peter used to live in London, ______

A. usedn’t he


B. wasn’t he
C. didn’t he use


D. didn’t he use to
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单项选择题
To succeed in a scientific research project, ______.
A. persistence is needed

B. persistence is what one needs
C. one needs to be persistent
D. one needs be a persistent person
单项选择题
Had he worked harder, he ______ the exams.
A. must have got through

B. would get through
C. would have got through

D. could get through
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