示例 1 · FIBRW
预约借书：核对词形、搭配与领取条件
60 词 · 3 个空位 · 各空独立选项
每个空位有独立的四个选项。先看空位两侧，再核对最后一句规定的条件。
英文短文与空位
To collect reserved books, each resident must (1) _____ a confirmation email at the desk. Staff (2) _____ the email details with the reservation record before handing over the books. Residents who cannot arrive on the chosen date may collect them the following day (3) _____ they notify the library in advance. This extension is available only to residents who have given notice.
每空独立选项
参考答案、逐空依据与自检（可展开或收起）
填入参考答案的完整文本
To collect reserved books, each resident must present a confirmation email at the desk. Staff compare the email details with the reservation record before handing over the books. Residents who cannot arrive on the chosen date may collect them the following day provided they notify the library in advance. This extension is available only to residents who have given notice.
以下是原创虚构练习的参考答案，不是官方答案或评分报告。对照语法、搭配和上下文检查理由，不要只背三个词。
逐空检查依据
空 1 — present
完整英文上下文To collect reserved books, each resident must present a confirmation email at the desk.
must 后接动词原形；present a confirmation email 表示出示确认邮件，既满足语法，也符合柜台领取的情境。
为什么不选干扰项presence 是名词；presenting 是 -ing 形式；presented 是过去式或过去分词。它们都不能直接放在 must 与 a confirmation email 之间。
空 2 — compare
完整英文上下文Staff compare the email details with the reservation record before handing over the books.
compare A with B 表示把邮件信息与预约记录相互核对。前后两个信息来源，以及核对后再交书的顺序，支持 compare。
为什么不选干扰项四个选项都是动词原形，不能仅靠词形排除。borrow 表示借入，postpone 表示推迟，repair 表示修理，都不能表达这里把两份信息对照核验的动作。
空 3 — provided
完整英文上下文Residents who cannot arrive on the chosen date may collect them the following day provided they notify the library in advance. This extension is available only to residents who have given notice.
provided 在此引出“前提是提前通知”的条件。下一句 only to residents who have given notice 明确要求通知，排除了含义相反的 unless。
为什么不选干扰项unless 会把条件变成“除非通知，否则可以延期”，与下一句冲突。during 和 despite 不能在这里直接引出 they notify 这个完整限定从句。
填完后自检
- 能否说明为什么 must 后只接受 present？
- 能否从 with 和两份信息解释 compare，而不是只看中文词义？
- provided 的条件是否与最后一句 only 的限制一致？