Many people believe that our species ______ threatened with extinction.A、is B、a

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问题 Many people believe that our species ______ threatened with extinction.

选项 A、is
B、are
C、are to be
D、used to be

答案 A

解析主谓一致题。species是复数形式表示单数意义，谓语动词用单数，并且主句用的时态是一般现在时，故从句也用一般现在时，故选A 。

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