导航:题目详情 | 答案解析 | 相关问题 | 最新问题 63._________A. have helpedB. helpedC. had helpedD 外语类 2020-04-28 00:06:29 已帮助 人 63._________A. have helpedB. helpedC. had helpedD. was helped 热搜:关于氨基酸代谢错误的论述是_________。 答案解析 难度★★☆ 搜索 答案:A句子后面的时间状语由since引导,所以句子应该使用现在完成时。 相关问题 1、If they had taken my advice they _______ .A had wonB could wonC should winD could have 2017-07-14 2、I have been very lucky to have had ______ managers during my career so far.A: terrific 2017-07-24 3、Not until the game had begun______at the sports guound.A.had they arrivedB.would they have 2017-08-25 4、I would have written before but I______ill.A.have beenB.would beenC.had beenD.were 2018-02-23 5、【C10】______A.had votedB.had been votingC.have votedD.were voting 2019-10-14 6、If we ______ sooner we might have got there.A.startedB.had startedC.would have startedD.s 2019-11-16