Miss. Li, , is active all the time. Although she has not been well these days, her class is still full of laughter.
A.as you know B.start with
C.all in all
A
【详解】
句意:正如你所知,李老师一直都很活跃。虽然她最近身体不好,但她的课仍然充满了笑声。考查介词短语辨析题。A. as you know如你所知,插入语;B. start with以……开始;C. all in all总而言之,用于总结。根据句意语境,可知as you know符合句意,故选A。