题干
Most smokers say they _______ smoking to some degree but health experts suggest that they should give it up ______ their health.
A：benefit; for the benefit of
B：benefit from; with the benefit of
C：benefit; in the benefit of
D：benefit from; for the benefit of
答案(点此获取答案解析）
D
有意义的x的取值范围是【 】