问题补充：
It is necessary for children to exchange ideas with parents from time to time so that the generation gap between parents and children can be .
A. released
B. replaced
C. narrowed
D. disappeared
答案：
A. released
B. replaced
(答案→)C. narrowed
D. disappeared
解析：
试题分析: 考察连词意思辨析。句意：孩子时不时与父母交换意见是必要的，这样可以使父母与孩子的代沟减小。narrow Vt.使变窄；release Vt.释放；replace Vt.替代；disappear Vi.消失。D为不及物动词，不可用于被动语态。
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