单选题 Whether a policy that is "good" in the aggregate sense ______ also "good" for a particular person, however, ______ a different matter.
A. is... is B. is... / C. /... is D. is... being

【正确答案】 A

【答案解析】[解析] 本题中的主语是whether引导的主语从句“Whether a policy…______also 'good' for a particular person”，从中可以看出这里缺少系动词“is”，“that is 'good' in the aggregate sense”为定语从句；表语是“a different matter”，主语与表语之间同样缺少系动词“is”，因此A项正确。