The poet composed a poem while . . . . . . . . under a tree. A. sitting B. sat C. sit D. sits

The correct answer is A. sitting.

The other options are incorrect because they are not in the past participle form. The past participle form of the verb “to sit” is “sitting.” This is the form of the verb that is used after the auxiliary verb “to be” in the passive voice. In this case, the poet is the subject of the sentence, and the action of

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