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There is no reply when I ring him. He must have left the office already. The correct answer is option C. Must have left. The word "must" is an example of a modal verb of probability. Modal verbs of probability are used when we are not sure or uncertain about a certain situation or action.

There is no reply when I ring him. He must have left the office already. The correct answer is option C. Must have left.

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The word "must" is an example of a modal verb of probability.

Modal verbs of probability are used when we are not sure or uncertain about a certain situation or action.

Thus, optic "C" is correct.

To learn more about modal verb click here:

https://brainly.com/question/18428112

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