复发性阿弗他溃疡愈合后可形成瘢痕或组织缺损的类型是（）

A.轻型阿弗他溃疡

B.重型阿弗他溃疡

C.疱疹型复发性阿弗他溃疡

D.口炎型口疮

E.以上都不是

In using the morphological rules, we must guard against o in that different words may require different affixes to create the same meaning change.