英语 选择题 较难

从句引导词选择 — 英语选择题

大学英语(综合教程) 语法结构 AI 三重审校通过

题目
The archive preserved the map on ___ the surveyors relied; ___ the northern route crossed the marsh or avoided it remains unresolved. A. which; whether B. that; whether C. which; that D. that; what