A.that B.what C.it was D./_A.__ the dog was the first animal to be domesticated is generally agreed upon by authorities in the field.

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A.that B.what C.it was D./_A.__ the dog was the first animal to be domesticated is generally agreed upon by authorities in the field.
A.that B.what C.it was D./
_A.__ the dog was the first animal to be domesticated is generally agreed upon by authorities in the field.

A.that B.what C.it was D./_A.__ the dog was the first animal to be domesticated is generally agreed upon by authorities in the field.
答案是a.
1.因为所填的介词因在这引导一个主语从句the dog was the first animal to be domesticated.在英语关系从句中,只有that可以引导主语从句,放在句首.
2.因为主语从句是一个完整的句子,而what在定语从句中是充当成分的,所以b不正确.3.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,由于题目中所选介词后引导的是个主语从句且该主语从句是一个完整的句子,因此c不正确.
4.而d选项,若不填,则题目中,在一个句子中会出现两个谓语“was”和“is”,这违背英语语法.

the dog was the first animal to be domesticated
is generally agreed upon by authorities in the field。
句子给你分成了两部分两部分分别是主语和谓语这说明原句子已经是比较完整的句子了不缺任何成分了所以你要选择的词不能充当任何成分所有...

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the dog was the first animal to be domesticated
is generally agreed upon by authorities in the field。
句子给你分成了两部分两部分分别是主语和谓语这说明原句子已经是比较完整的句子了不缺任何成分了所以你要选择的词不能充当任何成分所有只有选that 那样子的话第一部分就是that的同位语也就是that和第一部分的句子是充当的一个成分所以。。。
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