以下是20道完形填空题及答案解析，涵盖不同场景和语法点，供学习参考：
一、语境理解类
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上下文关联
"The company decided to expand its operations to new markets last year. As a result , they hired more staff and opened several new branches."
- 答案 ：expand（扩大）
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逻辑推断
"She always arrives early and leaves late for work, showing great discipline ."
- 答案 ：early（早）
二、语法填空类
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时态与语态
"By the time we arrived, the meeting had already started . The speaker was presenting a compelling argument."
- 答案 ：had already started（过去完成时）
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非谓语动词
"Walking down the street, I saw an old friend. We hadn't seen each other in years."
- 答案 ：saw（过去分词作后置定语）
三、词汇辨析类
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近义词选择
"The movie was thrilling with lots of suspense, but the ending was a bit disappointing ."
- 答案 ：thrilling（令人兴奋的）
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固定搭配
"She has a ** keen eye** for detail and always catches red flags in her work."
- 答案 ：keen eye（敏锐的洞察力）
四、阅读理解类（含填空）
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细节理解
根据文章内容，作者提到："The project was challenging due to limited resources, but with teamwork, we overcame the obstacles."
- 答案 ：challenging（具有挑战性的）
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因果关系
"Due to the rapid development of technology, many traditional jobs have been eliminated ."
- 答案 ：rapid（快速的）
五、完形填空综合练习
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短文填空
"The company's new policy encourages flexibility . Employees can work from home on certain days, which has improved productivity ."
- 答案 ：flexibility（灵活性）
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逻辑填空
"She always pays close attention to the weather forecast and adjusts her plans accordingly."
- 答案 ：pays close attention（密切关注）
答案解析示例
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第1题 ：根据上下文，"expand"（扩大）符合公司扩展业务的逻辑，且与"resulted"构成因果关系。
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第5题 ："become afraid of"是固定搭配，表示"对...感到恐惧"，符合句意。
建议
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做题时先通读全文，理解大意再填空；
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注意动词时态、语态和非谓语动词的用法；
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对于固定搭配要结合语境记忆。
如需完整答案解析或更多题目，可参考权威英语学习网站。