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 “抢劫案”与“报道”之间是被动关系，首先排除主动语态的B、D选项。a series of,aspecies of,a portion of,a kind／type of等加上名词时，谓语动词一般用单数形式，因为series，species，portion，kind，type前面被不定冠词a限定，因此是单数。
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