in constant demand as a speaker,Ms Cherneck has never been busier than she is nowin constant demand as a speaker,是什么成分?都有哪些成分可以像这样被逗号隔开?

问题描述:

in constant demand as a speaker,Ms Cherneck has never been busier than she is now
in constant demand as a speaker,是什么成分?
都有哪些成分可以像这样被逗号隔开?

是状语
介词短语,名词短语...很多.
常看到的With.,就很典型.