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请问“We wanted to know what he was at that

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请问“We wanted to know what he was at that
请问为什么要用was而不是does?
请问“We wanted to know what he was at that
我们想要知道那个时候他是干什么的.
问职业:what+be+主语?或者 what+do/does+主语+do?
在宾语从句中要用陈述句语序,所以应该用what he was或者是what he did (从at that time 可知道用过去时,所以不用does)