题目

His sudden look of fear made _____ clear that he had something to do with the matter． A．him B．this   C．it      D．that 答案：C 解析: it做形式宾语。函数y=log2（4x-3）的定义域为（ ）A．（，+∞）B．[，+∞）C．（，+∞）D．（-∞，）