问题
选择题
John was about to go back to sleep ______ suddenly his bedroom became as bright as day．
A．after
B．when
C．while
D．until
答案
答案：B
考查固定结构。Be about to do…when…刚要做某事，这时……；句意：约翰刚要回去睡觉，这时突然间他的卧室变得和白天一样亮。所以选B。
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