问题
单项选择题
Evidence came up which specific speech sounds are recognized by babies as young as 6 months old.
A．whose
B．what
C．that
D．with
答案
参考答案：C
解析： 在本句中specific speech sounds are recognized by babies as young as 6 months old是前面evidence的同位语，因此应由that引导，答案应为C。