Alfred lost more than 180 pounds since having an operation t

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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

OA: C

What's wrong with options B and D?

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by VJesus12 » Wed Nov 08, 2017 8:06 am
Exactly ardz24, what is wrong with option D?

In addition, what is wrong with option E?

Experts, I would love your explanation here. Please.