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Arecentannouncementbyscientiststheyhavesuccessfullyclonedthefirsthumanembryohascausedmuchdebat.A.inwhichB.that因为是同位语从句,那为什么不能看成是定语从句呢,intheannouncement不是也可以吗

题目详情
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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答案和解析
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?