单选题 I was surprised to find that they all fell in with my suggestion at once.
【正确答案】 B
【答案解析】[解析] 本句意思：我惊讶地发现他们立即同意了我的建议。fall in with同意。turn down关小，调低，拒绝；agree to同意；cut off切断，阻断；carry out执行，实行。