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 ProfessorBackmantookupscientificresearchfordecades(幾十年...

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問題詳情:

 ProfessorBackmantookupscientificresearchfordecades(幾十年...

 Professor Backman took up scientific research for decades (幾十年), and this is ______ he devoted all his life to.

A. which               B. what             C. where            D. how

【回答】

B

知識點:連詞

題型:選擇題

標籤:幾十年