I realized that I (forget) to thank them. Which ...

[ 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

Select your answer:

Random Topics:
Grammar - some / any Preposition Form Noun Quantifiers Grammar - must & have to Comparision First Conditional Sentence Future Tense Vocabulary Comparison and Modals Past Simple Verbs

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