问题
选择题
You should visit your parents _____, even when you are very busy.
A．by and by
B．more or less
C．step by step
D．now and then
答案
D
题目分析：考查固定短语。A 不久以后B 或多或少C 逐渐的D时不时。句意 你应时不时去看看你的父母，尤其当你很忙的时候。根据句意选D项
考点 : 考查固定短语