Itisbelievedthatanewkindofdrug 国语站 题库 2.34W 大中小设置文本大小 问题详情:It is believed that a new kind of drug _____ by the scientists and they are hopeful that they will succeed in a few months. A. has been developed B. is being developedC. is developing D. has developed【回答】B知识点:现在进行时及其被动式题型:选择题 TAG标签:#