I’m considering _______ a computer, which should be a great help to my work. A. to buy B. buying C. buy D. to buying
某工程需要在规定日期内完成，如果甲工程队单独做，恰好如期完成； 如果乙工程队单独做，则超过规定日期3天，现在甲、乙两队合做2天，剩下的由
已知ABCD中，有=(-2,1),=(3,7)，则向量的坐标是______________.
Most of the students in our class come from _____. A. the north B. north C. the northern D. northern
--What about seeing the film “The Girl in Red”? ---Sorry. I _________ it before. A. saw B. will see C. have seen D. see
对于某些离子的检验及结论一定正确的是（） A.加入稀盐酸产生无色气体，将气体通入澄清石灰水中，溶液变浑浊，一定有 B.加入氯化钡溶液有白色沉
[生物一选修3现代生物科技专题] 克隆羊的成功轰动世界，它不仅奠定了疾病克隆性治疗的基础又解决了器官移植中供体不足的问题,同时也给人类带来了
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
