______ evidence that language-acquiring ability must be stimulated.

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问题 ______ evidence that language-acquiring ability must be stimulated.

选项 A、If being
B、It is
C、There is
D、There being

答案C

解析 分析句子结构,如果填上A项或D项,句子缺乏谓语。因此C项为正确答案。
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