1樓：
首先，整句話的主語是that引導的從句all the students think it their duty to study hard ，這是一個句子，這個句子的主語是all the students，謂語think，it作形式賓語指代 their duty to study hard
如果去掉it這裡就要用一個從句all the students think that it is their duty to study hard，這會導致從句裡包含從句使句子顯得複雜
2樓：滑尋雲
that all the students think it their duty to study hard has laid the foundation for the university's high reputation.=that all the students think to study hard is their duty has laid the foundation for the university's high reputation.
that all the students think it their duty to study hard 從句做主語
has laid 謂語
the foundation 賓語
for the university's high reputation.介詞短語，做目的狀語
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