His experiences as a volunteer in the quake-hit areas have changed his attitude toward society and influence his future life．
A. is to
B. was going to
C. are to
D. were sure to
网友回答
A. is to
B. was going to
(答案→)C. are to
D. were sure to
解析：句意：他在地震灾区作为志愿者的经历已经改变了他对社会的态度，并且将会影响他未来的生活。句中experience经历作为主语，可数名词，and后面缺少谓语动词，谓语动词要用复数形式。通过句意可知，影响应该是发生在将来，不定式to do 可以表示将来的动词，故选C.