I go back to sleep when suddenly my bedroom became as bright as day.
A. was about to
B. was just to
C. would
D. was to
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(答案→)A. was about to
B. was just to
C. would
D. was to
解析：考查固定结构。Be about to do sth when…正要做某事在这时…；句意：我正要回去睡觉在这时我的卧室变得像白天一样光亮。