问题补充：
I am concerned, Peru is well worth a visit.
A. Even if
B. In my opinion that
C. As is known that
D. As far as
答案：
A. Even if
B. In my opinion that
C. As is known that
(答案→)D. As far as
解析：考察连词辨析。Even if即使；BC项不符合语法结构；as far as sb be concerned在某人看来，根据某人的观点；句意：在我看来，秘鲁十分值得参观。故D正确。
