Cheer up!Everyone may have periods in their lives ____ everything seems tough.A.when B.where C.which D.that

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Cheer up!Everyone may have periods in their lives ____ everything seems tough.
A.when B.where C.which D.that

定语从句
everything seems tough修饰 periods,意为“每个人在生活中都有事事艰难的时候”
先行词periods,表时间,从句缺时间状语,所以填when~