第一节：短文改错(共10小题；每小题l分，满分l0分)

Christine was just a girl in one of my class. I never knew much about her except for that she was strange. She didn’t talk many, her hair was black and purple, and she worn black sports shoes and a black sweater, although in the summer. She was, in fact, rather attractively, and she never seemed care what the rest of us thought about her. Like the rest of my classmate, I didn’t really want to get closest to her. It was only when we did their chemistry project together that I begin to understand why Christine dressed the way she did .

40. Once harm ______ to the environment, it takes years to have the system recovered.

A. does　　　　　　　　　 B. is done　　　　　　　 　 C. will be done　 　 　　D. be done