GRE Text Completion: Maggoosh-GRE填空Maggoosh - NS77075C8P5O149KY

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