The manager is well aware of a few other problems _______ he knows we have had w

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问题 The manager is well aware of a few other problems _______ he knows we have had with the customers in the past five years.

选项 A、which
B、those
C、what
D、whichever

答案 A

解析空格前后有两对“主语+动词”，所以空格内应填入连词。he knows是插入语。B选项不能做连词，what和whichever在前面没有先行词的时候使用。正确答案是which。做关系代词。在从句中做have had的宾语。

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