问题补充：
Kate the hills when she was young.
A. preferred to climb; rather than exercise
B. prefers climbing; to exercising
C. preferred to climb; to exercise
D. preferred climbing; to exercising
答案：
A. preferred to climb; rather than exercise
B. prefers climbing; to exercising
(答案→)C. preferred to climb; to exercise
D. preferred climbing; to exercising
解析：句意：当她年轻时，凯特为了锻炼，宁愿去爬山。本句中不定式to exercise做目的状语，表示具体的将要进行的动作。前文prefer to表示更喜欢做某事，故选C。
