___professor as he was,he couldn' t work out the problem at once.用什么冠词

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___professor as he was,he couldn' t work out the problem at once.用什么冠词
___professor as he was,he couldn' t work out the problem at once.用什么冠词

___professor as he was,he couldn' t work out the problem at once.用什么冠词
Though he was a professor,he couldn't work out the problem at once.

让步状语从句 though he was professor, he couldn't work out the problem at once.

什么冠词也不加,因为是倒装句,所以本来应该加a,但是由于是倒装句,所以省略。完全的应该是:as he was a professor.