We can't plain that children are cheating in examinations adults themselves have set such a bad role model for them to follow.
A. because
B. unless
C. when
D. though
网友回答
A. because
B. unless
(答案→)C. when
D. though
解析：句意：如果成年人自己为孩子树立这么差的榜样让他们效仿，我们不能抱怨孩子考试作弊。这里用when表示“如果，既然”，A. because因为，B. unless除非，如果不， D. though虽然，选C。