A. was working
B. works
C. is working
D. has been working
Sentence is in present perfect continuous tense with active voice.
Rule :
Subject + have/has + been + V-ing + other agents.
A. was working
B. works
C. is working
D. has been working
Sentence is in present perfect continuous tense with active voice.
Rule :
Subject + have/has + been + V-ing + other agents.