Once you learn how to write a well structured paragraph, the next thing . . . . . . . . done is editing your draft.

A. has to be

B. have to be

C. to be

D. was

Answer: Option C

Solution(By Examveda Team)

The verb 'to be' is used as an auxiliary to form passive tenses. In this case, the auxiliary 'be' is followed by the past participle of a verb.