GRE Text Completion: JiJing 1373-GRE填空机经1373题 - 7N4L16K72WG26384A

For decades, Pluto seemed to be the mysteriously ____________ planet: it was first thought to be about as large as Earth, but, subsequently, measurements had it smaller and smaller. A. morphing B. appearing C. dwindling D. orbiting E. contracting F. emerging