He stayed up too late every night,______ to catch up with his classmates.[      ]

A.Having determined

B. being determined

C.determined

D.to determine

“不观高崖，何以知颠坠之患？不临深渊，何以知没溺之患？不观巨海，何以知风波之患？”下列对这一说法，理解正确的是（ ）

A．直接经验比间接经验重要

B．实践是认识的来源

C．感性认识真实可靠

D．一切从实际出发