GRE Text Completion: Fundamental 24 Sets-GRE填空基础24套 - 93PJMF7G0V28207Y!

Like avid gardeners who attack weeds tirelessly, some damselfish are ____________ weeders of algae gardens in coral reefs. A. dilatory B. sluggish C. indefatigable D. unwieldy E. capricious F. unflagging