Sometimes _____to place physic

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Sometimes _____to place physics and chemistry into separate categories.
选项:
a、difficult
b、is difficult
c、it is difficult
d、that is difficult

解题思路：如下
解题过程：
选C。此句是it做形式主语的固定句式，该结构为：
“ It is+形容词+ to do sth ”表示“做某事是....的”，其中，真正的主语是后面的动词不定式结构。
再如：
It is important to practise listening.练习听力很重要。
最终答案：略

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