______dog was the first animal to be domesticated is generally agreed upon by authorities in the field.

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问题 ______dog was the first animal to be domesticated is generally agreed upon by authorities in the field.

选项 A、Until the
B、It was the
C、The
D、That the

答案D

解析 本题考查名词性从句。分析句子结构可知,谓语动词应该是is agreed upon,故is前面的部分应该是主语,即主语从句。that引导的主语从句可以位于句首。因为主语从句是一个完整的句子,而it was后面引导的是宾语从句,或在句型“it is/was…that…”中引导主语从句,因此[B]项不正确。until不能引导主语从句,排除[A]项;that引导主语从句位于句首时,that不可省略,故排除[C]项。
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