问题补充:
Mail or gifts posted by companies to customers advertising.
A. are another
B. is the other
C. are other
D. is another
答案:
A. are another
B. is the other
C. are other
(答案→)D. is another
解析:本题考查主谓一致。句中由or连接的两个主语,其谓语动词与前一个主语保持一致,故谓语动词用单数;代词another指不定范围中的另外一个,故选D。