A recent announcement by scientists ____ they have successfully cloned the first human embryo has caused much debat.A.in which B.that因为是同位语从句,那为什么不能看成是定语从句呢,in the announcement不是也可以吗

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A recent announcement by scientists ____ they have successfully cloned the first human embryo has caused much debat.A.in which B.that因为是同位语从句,那为什么不能看成是定语从句呢,in the announcement不是也可以吗

A recent announcement by scientists ____ they have successfully cloned the first human embryo has caused much debat.A.in which B.that因为是同位语从句,那为什么不能看成是定语从句呢,in the announcement不是也可以吗
A recent announcement by scientists ____ they have successfully cloned the first human embryo has caused much debat.
A.in which B.that
因为是同位语从句,那为什么不能看成是定语从句呢,in the announcement不是也可以吗

A recent announcement by scientists ____ they have successfully cloned the first human embryo has caused much debat.A.in which B.that因为是同位语从句,那为什么不能看成是定语从句呢,in the announcement不是也可以吗
选择B
A recent announcement by 《《scientists that they have successfully cloned the first human embryo》》 has caused much debat.
明白了吗?

因为根据从句的意思判断是对announcement进行解释说明的,而不是限定是哪个announcement的
in the announcement 的话就在从句中做了状语了,而that引导同位语从句时本身在从句中是不做语法成分的,只起到引导词的作用。

定语从句的话先行词是???