单选题 The school board listened quietly as John read the demands that his followers ______ for.
A. was demonstrating B. demonstrate
C. had been demonstrating D. have demonstrated

【正确答案】 C

【答案解析】[解析] 根据题意，空档所在部分为定语从句，先行词为demands。根据一致原则，可将B和D先排除。as从句中，read这一动作明显先于demonstrate这一动作，因此C为正确答案。