A. sent
B. been send
C. send
D. been sent
Sentence is in present perfect tense.
Rule :
Subject + have/has + been + V3 + other agents.
The letter has already been sent. It must have reached by now.
A. sent
B. been send
C. send
D. been sent
Sentence is in present perfect tense.
Rule :
Subject + have/has + been + V3 + other agents.
The letter has already been sent. It must have reached by now.