Topics: Past Perfect and Past Perfect Continuous Tense
And then finally, after he told me everything, I realised what _________ (happen) to him when he was a little boy.
A. had happening
B. had been happened
C. had happened
D. had been happening
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She ________ (teach) chemistry before she became a journalist.
A. had teached
B. had been teached
C. had been taught
D. had been teaching