问题
选择题
________evidence that language acquiring ability must be stimulated.
A．If being
B．It is
C．There is
D．There being
答案
C
句中有连词that和谓语must be stimulated，缺少一个谓语动词，排除A,D，该句译成汉语是"有。。。的证据",而不是"它是。。。的证据"所以排除B.
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