题目内容：

选择一个答案并解释说明what he thought and did at home(has have) nothing to do with his problem

优质解答

主语是一个整体的,谓语用单数.
what he thought and did;
the writer and poet;
the fish and chips;
etc.
关键看冠词的数量,再联系上下文校对一下