问题补充：
In my opinion, parents and teachers are supposed to set an example of good behavior to children they are role models to them.
A. although
B. even if
C. unless
D. as
答案：
A. although
B. even if
C. unless
(答案→)D. as
解析：本题考查连词。although虽然；尽管；even if即使；unless除非；as因为；句意：在我看来，父母和老师都应该为孩子树立好榜样，因为他们是孩子的榜样。
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