When does a neutron from one atom collides with the nucleus of another atom, a chain reaction can occur.

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问题 When does a neutron from one atom collides with the nucleus of another atom, a chain reaction can occur.

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答案does—去掉does

解析 译文:当一个原子的中子与另一个原子的原子核相碰撞,就会发生链式反应。
分析:考查从句。此句的when引导时间状语从句,时间状语从句中,when后应直接跟主语,does多余。故删掉。
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