Choose the most appropriate option to fill in the blank. When the police discovered the evidence of murder in Mr. Sharma's house, Mrs. Sharma said, " This is impossible. It ____ be a mistake."
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A.
must
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B.
might
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C.
can
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D.
may
Correct Answer:
A. must
Explanation:
The modal verb "must" signifies a necessity for an event to occur and is typically employed for firm personal duties. Therefore, option (a) is the correct choice.
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