题目
the poor boy（）an operation at this time yesterday
A has been perfomed
B was being performed
C was performed
D is being performed
求说明选择的原因、
A has been perfomed
B was being performed
C was performed
D is being performed
求说明选择的原因、
提问时间：2020-12-14
答案
B was being performed
使用被动语态四个选项都是,但是后面的at this time yesterday表明要用过去进行时态.
使用被动语态四个选项都是,但是后面的at this time yesterday表明要用过去进行时态.
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