【题目】The students have been working hard on their lessons and their efforts ______ success in the end.
A.rewarded
B.were rewarded
C.will reward
D.will be rewarded

【答案】D
【解析】题目考查时态和语态。句意：学生们一直在刻苦学习功课，他们的努力（将来）一定会得到回报。句意可知，回报是将来要发生的事情，应该用将来时；efforts和reward是被动关系，应该使用被动语态，故选D。