单项选择题

I had just______ my own business so that, I couldn't travel every week.

A. earned
B. gave
C. held
D. opened
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Peter is one of the few persons I know who ______ learnt from experience.
A. has
B. was
C. had
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He could not start the engine, no matter______hard he had tried.
A. when
B. where
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