Don't make a noise while I ( )my homework. A did B do C am d

Don't make a noise while I ( )my homework.
A did B do C am doing D was doing
详解
对于WHILE的解析
n.
a period of indeterminate length (usually short) marked by some action or condition
所以
本句子 选C
附加 运用
Mister Chavez married Helena Fabela whom he met while working in the grape fields in central California.