Don't you think it is adj 与Don't you think it adj的区别.比如：Don't you think it
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Don't you think it is challenging to play against the green team?
这是宾语从句
challenging是现在分词作补语.
都可以用,意思一样
======以下答案可供参考======
供参考答案1:
填 is challenging 。
challenging 在这里是形容词，富有挑战性的。It 是形式主语，真正的主语是to play against the green team ，is 是谓语动词，后面加形容词，且不可省略，否则句子不完整。