[ 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

Random Topics:
Perfect Verb TensesTenses: Present simple, Past Simple, Future SimpleSimple Past TensesNoun, Adjective, and Adverb ClausesPast and Perfect TensesGrammar - much, many, a lot ofSentence Structure and ConjunctionsPresent Simple: affirmative, negative, interrogativeOrdering AdjectivesVerbs & Verb TensesOther quiz:
Relative Clause › ViewI hope the police will catch the thief __________ stole your wallet.
A. who
B. whom
C. which
D. whose
Adjective Clause › View
None of the house ___ have protective shutters were damaged in the typhoon.
A. who
B. they
C. which