显然地，我的新陈代谢速度在我没意识到的情况下就减缓了。

A.APPARENT MY METABOLISM HAD SLOW DOWN WITHOUT MY EVEN REALIZE IT.

B.APPARENTLY MY METABOLISM HAVE SLOWED OFF WITHOUT MY EVEN REALIZING IT.

C.APPARENT MY METABOLISM HAS SLOWED OFF WITH ME EVEN REALIZE IT.

D.APPARENTLY MY METABOLISM HAD SLOWED DOWN WITHOUT ME EVEN REALIZING IT.

正确答案是D