[ Past Perfect Simple & Past Perfect Continuous ]
I realized that I (forget) to thank them.
Which is the correct past perfect simple for the sentence above?
A. had forget
B. has forgotten
C. having to forget
D. had forgotten
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Nouns and QuantifiersLinking Words and PhrasesSimple Present and Simple PastMixed TensesModal and Modal PerfectVerbs + Infinitives / GerundsPresent Perfect Negative and InterrogativeMixed ConditionalSimple TenseTime and CalendarOther quiz:
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