In each of the following questions, sentences are given with blanks to be filled in with an appropriate word(s). Four alternatives are suggested for each question. Choose the correct alternative out of the four as your answer.
The work _________ , he left his office

Options

A. having completed
B. having been completed
C. on being finished
D. having been over

Answer

B

Explanation

having been denotes a completed activity. It shows y happened after x has happened.
Here, having been completed is the right usage.