问题: ________ evidence that language-acquiring ability must be stimulated.
________ evidence that language-acquiring ability must be stimulated.
A) If being
B) It is
C) There is
D) There being
解答:
C
that language-acquiring ability must be stimulated.是evidence
的同位语，对evidence 内容的说明，可划掉不看 。
显而易见，这是there be句型
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