题目

The weather turned out to be fine yesterday. I ___ the trouble to carry my umbrella with me.    A. should have taken B. could have taken C. needn’t have taken D. mustn’t have taken 答案：C 解析: 略2．函数f（x）=$\sqrt{2x-3}$+$\frac{1}{{\sqrt{4-x}}}$的定义域为（　　）A．[${\frac{3}{2}$，4]B．[${\frac{3}{2}$，4）C．[4，+∞）D．（4，+∞）