______evidence that language-acquisition ability must be stimulated.

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问题 ______evidence that language-acquisition ability must be stimulated.

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

答案C

解析 句意:有证据表明,语言习得能力是必须被激励的。there be句型表示存在,that引导同位语从句解释evidence。
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