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Question 1:
Students ______ listen to the teacher.
A. Could
B. can
C. may
D. must
Feedback The modal verb 'must' has the meaning of obligation (from the speaker's point of view) or of emphatic advice. In different contexts 'must' may acquire additional shades of meaning, such as duty or necessity. In this meaning 'must' is found in affirmative and interrogative sentences and followed only by the simple infinitive.

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Test 1-Modal Verbs | Intermediate English