had + pp:過去完了形
have(has)+pp：現在完了形
I had been a mathematics teacher by 2002.
I have been a president of small marketing company.
8 years ago
Mar 10, 2008
my past
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had + pp:過去完了形
have(has)+pp：現在完了形
I had been a mathematics teacher by 2002.
I have been a president of small marketing company.
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