[W68] Everyone has periods in their lives ______ everything
2个回答

嗯 选A 因为这里是定语从句

everything seems very hard修饰 periods,意为“每个人在生活中都有事事艰难的时候”

这里periods 做状语,又表时间,所以填when

正常语序为:everything seems very hard (during periods) in their time.

再举个例子,供你揣摩啊:

We will never forget the days when we lived in the countryside,

我们永远不会忘记住在乡下的那些日子.

(We lived in the countryside in these days.)