We no longer keep up the close friendship of few years ago, though we still visit each other on occasion.

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问题 We no longer keep up the close friendship of few years ago, though we still visit each other on occasion.

选项 A、in good time
B、up to date
C、now and then
D、once and for all

答案C

解析 on occasion有时,不时;in good time在适当或有利时刻;up to date现代的;now and then时而,不时;once and for all只此一次,绝不再重复。
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