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The problem( )last week is very important A was discussed B discussed C being discussed B

题目详情
The problem( )last week is very important A was discussed B discussed C being discussed B
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答案和解析
The problem (discussed) last week is very important
答案是 B. discussed
是因为句子实际上是
The problem (which was) discussed last week is very important
which was 是隐含的.