I like this chocolate cake very much.______, is it healthy?

I like this chocolate cake very much.______, is it healthy?
A、By a way
B、By ways
C、By all ways
D、By the way
【正确答案】：D
【题目解析】：By the way意为“顺便地；附带说一句”。 By the way引导过渡状语（Transition-conjuncts），类似的词或词组有incidentally，now，meanwhile，in the meantime，in the meanwhile等。