题目内容
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[单选题]
In ______ experiment, thirty children were divided into three groups.
A.a such
B.such one
C.one such
D.such as
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题目内容
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题目内容
（请给出正确答案）
A.a such
B.such one
C.one such
D.such as
如果结果不匹配，请 联系老师 获取答案
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