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TOEFL iBT 2026 Complete the Words：一道真实练习题
这是我们的模拟试卷中的一组题目，与考试中出现的完全一致。考试本身使用英语。
Fill in the missing letters in the paragraph.
In the workshops of fifteenth-century Florence, painters prepared wooden panels through a sequence of carefully regulated stages. Craftsmen fi smoothed t surface, th applied nume thin lay of a chalky gro, each o which h to d completely bef the next was added. Although this preparatory process demanded considerable patience, it enabled subsequent pigments to adhere firmly and enduringly. The resulting smoothness, moreover, allowed artists to render delicate gradations of tone that would otherwise have been impossible to achieve.