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evidencethatlanguage-acquiringabilitymustbestimulated.A.beingthereB.shouldtherebeC.therewasD.therehavingbeen选好之后讲理由

题目详情
_______ evidence that language-acquiring ability must be stimulated.
A.being there
B.should there be
C.there was
D.there having been
选好之后讲理由
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答案和解析
这是一个从句吧,怎么说动名词短语做主语呢
是C呀