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. when ; before
B. when ; as
C. as ; after
D. while ; when
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(答案→)A. when ; before
B. when ; as
C. as ; after
D. while ; when
解析：考查固定句型。固定句型：be about to do sth when…正要做某事在这时…；句意：我已经起床了。正要去做早饭在这时电话响了，但是在我接电话之前，电话却挂断了。故A正确。