他们本可以按时完成项目的，但中途出现了技术故障。
They could have finished the project on time, but a technical issue came up.
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Could英 /kʊd/|美 /kʊd/
finished英 /ˈfɪnɪʃt/|美 /ˈfɪnɪʃt/
解释
could + have + finished 表示过去有可能按时完成但未完成，could 情态动词表过去可能性，have finished 为完成不定式表示未实现的过去动作
They could have finished the project on time, but a technical issue came up.
could + have + finished 表示过去有可能按时完成但未完成，could 情态动词表过去可能性，have finished 为完成不定式表示未实现的过去动作