In my opinion, all Mr Li good to his students in his class at present. He is very strict

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A. does does does
(答案→)B. does does do
C. does do did
D. did do does
解析：考查定语从句和强调句型。All是先行词，all后面省略了that，that作为does的宾语。第一个does是定语从句的谓语动词。第二个does表示强调，强调do。句意：在我看来，李先生坐的所有事情的确对他班里的学生有好处，在学习方面对学生很严格。故B正确。