Choose the form that foregrounds the ongoing activity rather than its completed output: Owen's hands are covered in fresh ink because he ___ posters in the print room; he is still at work and half the print run remains queued.

Explanation

Has been printing is right because the fresh ink shows recent activity and half the print run remains queued, so the process is unfinished. Has printed would foreground completed output rather than the ongoing activity that the sentence explicitly describes.