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I ______ on a maths problem when he telephoned me early this morning.
I ______ on a maths problem when he telephoned me early this morning.
admin
2012-05-08
55
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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本试题收录于:
公共英语二级笔试题库公共英语(PETS)分类
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公共英语二级笔试
公共英语(PETS)
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