A series of robberies ____ recently.

A series of robberies ____ recently.
A、has been reported
B、has reported
C、have been reported
D、have reported
【正确答案】：A
【题目解析】：【考点点击】本题考查主谓一致。【要点透析】首先应排除主动语态的选项。当a series of, a species of, a portion of, a kind/type of等加上名词时,谓语动词一般用单数,即谓语动词的单复数取决于 species, series, portion,kind,type是否是单复数,而不取决于of后面名词的单复数。本句中 series是被a限定的,因此是单数。