They must remember when they __(begin).

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Theymustrememberwhenthey__(begin).Theymustrememberwhenthey__(begin).Theymustrememberwhenthey__(begin

They must remember when they __(begin).
They must remember when they __(begin).

They must remember when they __(begin).
必须记得什么时候开始的,这里的开始应该是发生在记得之前的,所以填过去式
when they began,
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