__________, our English teacher never shows off. A.knowledgeable is he as B.is as he knowledgeable C.he is as knowledgeable D.knowledgeable as he is 选D，怎么解释才能让学生清楚明白呢？
记住as倒装用法,可以给学生举Young as he is, my little brother can speak English very well.虽然我弟弟很小,他能说一口很好的英语.这句换用although,就不必倒装Although he is very young,my little brother can speak English very well. 这道题目中文:虽然我们英语老师知识渊博,他从来不炫耀.