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问题
单项选择题
氏族公社形成的条件和基本标志是( )。
A.血缘婚
B.杂婚
C.族外婚
D.一夫一妻制
答案
参考答案:C
选择题
The two students _____ late yesterday.
A. are all
B. were all
C. are both
D. were both
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单项选择题
某台主机域名abc.gh.cn,其中()表示主机名。
A.abc
B.gh
C.co
D.cn
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