A rocket burns propellant rapidly and most rockets carry a supply that last just a few seconds.

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问题 A rocket burns propellant rapidly and most rockets carry a supply that last just a few seconds.

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答案last—lasts

解析 译文:火箭迅速燃烧推进剂,而大多数的火箭携带的补充物仅能维持几秒而已。
分析:考查主谓数的一致。定语从句中,若关系代词在从句中作主语,则从句谓语的数应与先行词一致。本题中,先行词a supply为单数,故last也应用单数形式lasts。
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