Although/ my mother/ be/ interested/ Hung King Temple Festival/ she/ never/ join
a. Although my mother be interested in Hung King Temple Festival, she has never joined it.
b. Although my mother is interested in Hung King Temple Festival, she has never joined it.
c. Although my mother is interested in Hung King Temple Festival, she has never joined.
d. Although my mother is interested in Hung King Temple Festival, she has never join.