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

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

选项 A、Until
B、It was
C、What
D、That

答案D

解析 that引导的从句作主语。一般情况下将主语从句放在句末,用无人称代词it作形式主语,如本句可改写为It is generally agreed upon by authorities in the field that the dogwas the first animal to be domesticated。能引导主语从句的除that外,还有选择连词whether…or,疑问副词why/when/where和疑问代词who/what/which等。
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