15. Ironically, the poet Henry Wadsworth Longfellow claimed he never liked teaching,
although ____ a professor at Harvard University and taught for many years.
(A) becoming
(B) he became
(C) had lie become
(D) for him to become
该题答案是B
请问,A为什么不能选,我认为A选项符合状语从句省略的条件:若状语从句的主语与主句主语一致,但从句谓语是实义动词,则从句内的主语可以省略,把谓语部分改为-ing形式。