题目

It is said _______has been translated into Chinese. A.that    B.which    C.that which    D.that that 答案：D 解析: 当宾语从句的主语是that时，that不可以省略 People say that that was how the Chinese first raised silkworms.  据说那就是中国人怎样最先开始养蚕的。

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