She ________ (teach) chemistry before she became a journalist. ...

★ Past Perfect and Past Perfect Continuous Tense

She ________ (teach) chemistry before she became a journalist.

A. had teached

B. had been teached

C. had been taught

D. had been teaching

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I ___________ (wait) for her for hours before she came.

A. had been waiting

B. has been waiting

C. had been waited

D. had waited