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英语大佬菜鸟都来看看吧!这里弄不明白

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Research has shown that two-thirds of human conversation (is taken) up not with discussion of the cultural……
But as the groups got bigger and bigger the amount of time (spent) in grooming activities also had to be extended to maintain its effectiveness.
第一句和第二句括号里都是非谓语动词为什么一个有is呢?


来自Android客户端1楼2019-08-16 19:15回复
    conversation time.....懂了没


    IP属地:浙江来自iPhone客户端2楼2019-08-19 22:01
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      第一个is作宾从里的谓语


      IP属地:江苏来自iPhone客户端3楼2019-08-19 22:03
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