A professor at the university has taken a sabbatical to research on James Baldwins books that Baldwin wrote in France while he was living there._research 为什么后面不加东西不应该是do research on the什么的或者关于什么的出国考试答疑器_GMAT

A professor at the university has taken a sabbatical to research on James Baldwin’s books that Baldwin wrote in France while he was living there.

A、on James Baldwin’s books that Baldwin wrote in France while he was living there

B、about the books James Baldwin wrote in France

C、into James Baldwin’s books written while in France

D、on the books of James Baldwin, written while he lived in France

E、the books James Baldwin wrote while he lived in France

research 为什么后面不加东西不应该是do research on the什么的或者关于什么的

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