Sasindran wrote:
Alfred lost more than 180 pounds since having an operation truncating his stomach three years ago.
(A) lost more than 180 pounds since having
(B) lost more than 180 pounds since having had
(C) has lost more than 180 pounds since
(D) has lost more than 180 pounds after
(E) has lost more than 180 pounds subsequently to
The answer is C
We need present perfect tense here as we can see the effects of the operation still now.
We need since to indicate the continuity of time .
Hope it helps
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