They ___ be on vacation. I saw their house was ...

[ Modal Verbs ]

They ___ be on vacation. I saw their house was locked up.

A. can

B. must

C. may

D. might

Select your answer:
A B C D E

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Take or Put Quantifiers & Modals of Obligation TOEFL Opinion / Agreement Passive Voice - Present Simple and Past Simple Relative Pronouns Past Progressive Tense Grammar - either...or, neither...nor Pronouns and Quantifiers Future Simple Tense

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