A-A+

______ entering his flat Jack was shocked to

2022-08-06 20:55:28 问答库阅读 181 次

问题详情

______ entering his flat, Jack was shocked to find his new computer missing.
A．In
B．On
C．By
D．At请帮忙给出正确答案和分析，谢谢！

正确答案：B
解析：On+Ving，表“当做某事时”，即as soon as“一……就……”。