问题补充：
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
答案：
(答案→)A. was about to
B. was just to
C. would
D. was to
解析：考查时态。该句为固定结构，即sb be about to do sth when .... 意为某人正要干某事的时候，突然……。
句意为，我正要回去睡觉，突然我的卧室里变得和白天一样亮。
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