做一道高中英语语法题It was three years____we finally met again.A.thatB.whenC.beforeD.since为什么不选D?

做一道高中英语语法题It was three years____we finally met again.A.thatB.whenC.beforeD.since为什么不选D? 求高手做一道高中英语语法填空题 求高手做一道高中英语语法填空题 求高手做一道高中英语语法填空题 求高手做一道高中英语语法填空题 一道高中英语语法填空求教第九题 做一道高中英语语法题I____Professor Hones had taught me this question.A.believeB.thinkC.wishD.suppose 一道高中英语语法填空求教第三第十题 一道高中英语语法填空,求教第2.6题 帮我做一道英语语法题,急 高中英语语法,it is 的强调用法如题 高中英语语法题, 高中英语语法题, 高中英语语法题, 高中英语语法填空题 高中英语语法题 高中程度英语题一道,求人解释……After ( )the skills of doing thr work ,we quicklly finished it.A acquired B acquire C having acquired D acquiring希望能解释一下 不要只是打个选项出来。答案是D 但是为什么C 一道高中数列题怎样做啊!