I'm not sure, but she ____ forgotten our appointment. ...

[ Perfect Modals ]

I’m not sure, but she ____ forgotten our appointment.

A. can’t have

B. might have

C. should have

D. must have

Select your answer:
A B C D E

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Grammar and Punctuation Pronouns and Adverbs Adverbs, Prefixes, and Suffixes Past Continuous Tense Auxiliary Words Frequency Relative Clause Perfect and Past Tense Past Future Tenses Adverbs and Time Expressions

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