( ) what way did he work out the physics A.In; question B.In; pro_英语解答

( ) what way did he work out the physics A.In; question B.In; problem C.By question,
D By,problem

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解答

B
in 表示用什么方式方法,way 方法.in this way 用这种方法.
work out 解决,算出.表明是难题用 problem