had been innovating

• past perfect progressive

  past perfect progressive

  Used to describe an action that was ongoing continuously in the past up until another past event interrupted it.

  of innovate.
  innovate

  verb (used without object)

  to introduce something new; make changes in anything established.

Related Words

• create
• devise
• establish
• experiment
• initiate
• introduce
• invent
• launch
• originate
• pioneer
• refine