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问题
选择题
.
The situation demanded that he ___________ present.
A was B is C be D were
答案
答案:
C
选择题
已知x
2
+y
2
=13,xy=6,则x+y的值是( )
A.±5
B.±1
C.±
5
D.1或
5
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名词解释
概念同化
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