NN帮忙~并列并列！

abby666666

1、as well as前一定有逗号吗？
2、形如”A,BandC”:and前一定有逗号吗？
3、关于but:prep1 157
Joachim Raff and Giacomo Meyerbeer are examples of the kind of composer who receives popular acclaim while living, often goes into decline after death, and never regains popularity again.

(A) often goes into decline after death, and never regains popularity again
(B) whose reputation declines after death and never regains its status again
(C) but whose reputation declines after death and never regains its former status
(D) who declines in reputation after death and who never regained popularity again（C）
(E) then has declined in reputation after death and never regained popularity
C中but后内容应和who receives popular acclaim while living并列，为什么but前还要有都逗号?

abby666666

ding

aeoluseros

but，yet，while等转折词前面通常都有逗号，但没有也不能算是错误.这跟承接或者并列类连词比如and不同。