题目

?Haven't seen you for ages! Where have you been??I went to Ningxia and ________ there for one year, teaching as a volunteer.A. stayed B. stayC. have stayed D. am staying 答案：【答案】A【解析】A 考查动词时态。此处and连接两个并列谓语，go和stay为顺承动作，用过去式。句意：好久没见到你了！你到哪里去了？我去宁夏了，在那儿待了一年支教。故选A。14．下列四个命题中是真命题的是（　　）A．x＞3是x＞5的充分条件B．x2=1是x=1的充分条件C．a＞b是ac2＞bc2的必要条件D．$α=\frac{π}{2}是sinα=1的必要条件$