2. 外语
  3. A series of robberies______recently.

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。
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