--What you when the phone rang?--I was washing my hair in the bathroom.A. were doingB.

问题补充：

--What you when the phone rang?

--I was washing my hair in the bathroom.

A. were, doing

B. was, doing

C. did, do

D. are, doing

答案：

(答案→)A. were, doing

B. was, doing

C. did, do

D. are, doing

解析：本题考查过去进行时的使用。本题的含义为电话响时你在做什么？我正在浴室里洗头。本题回答语表示过去正在进行的事，所以本题问句中的主句使用过去进行时，结构为was或were+动词现在分词，本题问句主语为you，故用were doing，故本题选A。