Last Sunday I spent a whole day in the library _______ the life of Mark Twain.A.to read on B.reading C.reading about D.on reading选哪个? 为什么

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Last Sunday I spent a whole day in the library _______ the life of Mark Twain.A.to read on B.reading C.reading about D.on reading选哪个? 为什么
Last Sunday I spent a whole day in the library _______ the life of Mark Twain.
A.to read on      B.reading         C.reading about      D.on reading选哪个?  为什么

Last Sunday I spent a whole day in the library _______ the life of Mark Twain.A.to read on B.reading C.reading about D.on reading选哪个? 为什么
B
固定搭配:spent sometime doing sth.