He thinks it his duty to help the sick.
题目
He thinks it his duty to help the sick.
我个人认为要加IS,可是好多人说可以不加，是不是真的可以不加呀？
请问Aug_Ge加与不加在句子意思上有不同吗？
答案
不对,应该是He thinks that it is his duty to help the sick.
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