Susan: Where are the students? Adam: I'm not sure ...

[ Grammar ]

Susan: Where are the students?

Adam: I’m not sure but they —- be in the canteen.

A. have to

B. must

C. might

D. had to

Select your answer:

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Subordination Conjunctions Compound Words and Sentences Comparative Adjectives and Adverbs Noun Clause Action Verb Vocabulary and Definitions Kinds of Sentences Simple Present - WH Questions Tense

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