I knocked on their door, but no one answered. They ...

[ Modals ]

I knocked on their door, but no one answered. They _____ early.

A. must leave

B. must have left

Select your answer:

Random Topics:
Independent and Dependent Clauses Connectors Prepositions after Verbs Past Passive Preposition of Direction IF CLAUSE Clauses Passive Voice in Past and Present Tense Personal pronouns + possessive adjectives + Introgative pronouns

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