—Who is that girl?
—_____.
He is Jack
She is good
She is my sister
He is Mr. Zhang
问句问那个女孩是谁，故选选项C项。
_____ interesting person our English teacher is!
How
What
What an
What a
本题考查感叹句的结构。句意：我们的英语老师是一个多么有趣的人啊！感叹名词 person 要用 what，先排除选项A；person 是可数名词单数，what 后不能缺少不定冠词，interesting 前要用不定冠词 an，故答案为选项C。