問題詳情

21. The origin of complex organisms called eukaryotes- which includes all animals, plants, and fungi- _____ one of biology’s biggest mysteries.
(A) is
(B) are
(C) being
(D) been

參考答案

答案：A
難度：適中0.433
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用户評論

【用戶】Yoho

【年級】高一下

【評論內容】The origin of complex organisms (called eukaryotes) ( - which includes all animals, plants, and fungi-)  _____ one of biology’s biggest mysteries.主詞( ) 補充說明，可省略_____ 主要動詞  (不會莫名其妙變化成being和been，所以先去掉選項C、D) 主詞補語The origin of complex organisms called eukaryotes- which includes all animals, plants, and fungi- _____ one of biology’s biggest mysteries.

【用戶】Yoho

【年級】高一下

【評論內容】The origin of complex organisms (called eukaryotes) ( - which includes all animals, plants, and fungi-)  _____ one of biology’s biggest mysteries.主詞( ) 補充說明，可省略_____ 主要動詞  (不會莫名其妙變化成being和been，所以先去掉選項C、D) 主詞補語The origin of complex organisms called eukaryotes- which includes all animals, plants, and fungi- _____ one of biology’s biggest mysteries.