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5.evidencethatlanguageacquiringabilitymustbestimulated.A.IfbeingB.ItisC.ThereisD.Therebeing为什么不是其他选项,尤其是D?

题目详情
5.____evidence that language acquiring ability must be stimulated.
A.If being B.It is C.There is D.There being
为什么不是其他选项,尤其是D?
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答案和解析
主句是:there is evidence,
同位语从句:that language acquiring ability must be stimulated指代evidence