______entering his flat, Jack was shocked to find his new computer missing.

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问题 ______entering his flat, Jack was shocked to find his new computer missing.

选项 A、In
B、On
C、By
D、At

答案B

解析 On+V-ing,表“当做某事时”,即as soon as“一……就……”。
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本试题收录于: 英语题库普高专升本分类
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