A series of robberies ________ recently.

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问题 A series of robberies ________ recently.

选项 A、has been reported
B、has reported
C、have been reported
D、have reported

答案A

解析 首先应排除主动语态的选项。其次,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是古是单、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。
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