题目

—When are you going to see your uncle? — _________ next week． A．some time            B．sometime                C．sometimes              D．some times 答案：B14．已知：关于x和y的二元一次方程y=kx+b的解有$\left\{\begin{array}{l}x=3\\ y=4\end{array}\right.$和$\left\{\begin{array}{l}x=-1\\ y=2\end{array}\right.$，求k，b的值．