The boys are . . . . . . . . their home task?

A. none

B. doing

C. do

D. both A and B

Answer: Option B

Solution(By Examveda Team)

The base form of the verb is do. The past simple form, did, is the same throughout. The present participle is doing. The past participle is done. As the sentence is in present participle form the correct answer will be 'doing'.