【題目】It's believed that humans' (祖先)is a kind of monkey.

【答案】ancestor
【解析】句意：人們認(rèn)為人類的祖先是一種猴子。that humans' ________(祖先)is a kind of monkey. 是一個主語從句，is是單數(shù)，所以主語從句的主語也用單數(shù)，所以填ancestor。

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