GRE Text Completion: JiJing 1373-GRE填空机经1373题 - 740I2TZDI777G56OA

The sailors realized too late that winds had shifted the ice in such a way as to obstruct the ship's path; this process had been so ____________ that it was completed by the time they discovered the effect. A. gradual B. negligible C. unpredictable D. time-consuming E. inconsequential F. imperceptible