I had just got up and was about to cook my breakfast _____the telephone rang loudly,but it hung up ______I could answer it.

A.while;when   B.when;as   C.as;after    D.when;before

I had just got up and was about to cook my breakfast ___the telephone rang loudly, but it hung up __I could answer it .

 I had just got up and was about to cook my breakfast ___the telephone rang loudly, but it hung up __I could answer it .

I had just got up and was about to cook my breakfast ________ the telephone rang loudly, but it hung up ________ I could answer it．

1. A.
   while; when
2. B.
   when; as
3. C.
   as; after
4. D.
   when; before