Explanation:

A. did he complain

The correct sentence is: "Not once while he was in the hospital did he complain about the pain."

This sentence uses the auxiliary verb "did" to form the emphatic form of the sentence. In English, the auxiliary verb "do" is used to form questions and negative sentences, and for emphasis when used in affirmative sentences. In this case, the emphasis is on the fact that he never complained about the pain while he was in the hospital.

Answer:

He Complained

Explanation:

Because The was word means past that why answer is he complaned