Jane could swim when she was only four years old.clever the girl was!AHow B．What

问题补充：

--- Jane could swim when she was only four years old.

--- clever the girl was!

A．How B．What a C．What

答案：

解析：句意：感叹句一般有两种结构：what +(a/an)+形容词+名词+主语+谓语！名词是复数或不可数名词，不加a/an.how+形容词+主语+谓语！根据结构，故选A。