Topic: Right Form of Verb,

Best Answer Explained in Below-:

The correct answer to the sentence "I wish I ------- a child again." is D) "were." This choice is based on the use of the subjunctive mood in English, which expresses wishes, hypotheticals, or situations contrary to reality.

In standard English grammar, when expressing a wish about a situation that is not true in the present, we often use "were" instead of "was," even with singular subjects like "I." The phrase "I wish I were" signals that the speaker is longing for a different reality—specifically, a time in the past when they were a child. This reflects a desire to return to a joyful, carefree stage of life.

In contrast, the other options do not fit grammatically or contextually. "A) is" and "C) has" both represent present tense, which is incompatible with wishing for a past state. "B) had been" implies a past condition, but it does not fit the structure needed for expressing a current wish. Thus, "I wish I were a child again" accurately captures the sentiment of longing for a different time, making it the correct choice.