单项选择题

Peter is one of the few persons I know who ______ learnt from experience.

A. has
B. was
C. had
D. have
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单项选择题
He could not start the engine, no matter______hard he had tried.
A. when
B. where
C. what
D. how
单项选择题
We congratulated him on ______ chairman.
A. his elected

B. his electing
C. his being elected

D. his elected
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