Identify the correct conjunction for this sentence: ______ the experiment failed, the data collected proved valuable.
答案解析
**Core Concept:** Concession clause (让步状语从句).
**Analysis:** 'Although' introduces a contrast between the experiment's failure and the useful data. Option A ('However') requires a semicolon or sentence restructuring. Option B ('Because') creates illogical causality. Option D ('Despite') needs a noun phrase, not a full clause.
正确答案:C