He wrote a book(.)keeping fit.A.for B.on C.of D.with

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He wrote a book(.)keeping fit.A.for B.on C.of D.with
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He wrote a book(.)keeping fit.A.for B.on C.of D.with
He wrote a book(.)keeping fit.A.for B.on C.of D.with

He wrote a book(.)keeping fit.A.for B.on C.of D.with
选择B.
这里on=about 意思翻译出来就是:他写了一本关于保持健康的书.
介词后面动词变ing形式这个自然不用多说.

B.on
他写了一本关于保持体形的书