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I ______ on a maths problem when he telephoned me early this morning.A、had worke
I ______ on a maths problem when he telephoned me early this morning.A、had worke
游客
2025-07-24
12
管理
问题
I ______ on a maths problem when he telephoned me early this morning.
选项
A、had worked
B、was working
C、have worked
D、have been working
答案
B
解析
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