单选题 The floods did not start to ______ until two days after the rain had stopped.

【正确答案】 C

【答案解析】[解析] 句意：直到雨停后两天，洪水才开始退去。“retire”退休，“retreat”逃避、退避，“recede”潮水退去，“sink”下沉、沉没。答案为C。