The professor began to work _____ on various research projects—though never to the point that she failed to attend to her classes, since whether she received tenure was determined not only by published research but also, to some extent, by student recommendations.
A.periodically
B.sporadically
C.monotonously
D.industriously
E.diligently
F.fruitfully
A.periodically
B.sporadically
C.monotonously
D.industriously
E.diligently
F.fruitfully