题目

26. Bob would have helped us yesterday, but he_______ A. was busy                B. is busy                  C. had been busy. D. will be busy 答案：A 解析: 略对溶液的基本特征叙述正确的是　 [     ]A．溶液是均一、稳定、无色透明的液体　　B．凡是均一、稳定、透明的液体就是溶液　　C．一杯调好的糖水，喝第一口特别甜，越喝越不甜，说明后面喝的糖水含糖少　　D．当条件不改变时，溶液虽然放置时间较长，溶质也不会从溶液中分离出来