Though he is only 5years old he can speak English very well.A. but B. and C. /

问题补充：

Though he is only 5years old, he can speak English very well.

A. but B. and C. /

答案：

解析：句意为：虽然他只有5岁，但是他的英语说得很好。本题考查连词的用法。Though表示转折，不可以和but同时使用。结合语境可知应选C。