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英语单选请教—Will you go shopping now? —Not until I ____ my experi

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英语单选请教
—Will you go shopping now? —Not until I ____ my experiment. A.have finished B.will finish C.finished D.had finished 求解析
英语单选请教—Will you go shopping now? —Not until I ____ my experi
【答案】选A(—你现在就去购物吗?—等到我完成我的实验(就去);这里的回答是not until的倒装与省略,补全了是“Not until I have finished my experiment will I go shopping”,正常语序为“I won’t go shopping until I have finished my experiment”)
再问: 你好,怎么看出来是省略的,我要是认为not untill开头have 要放I前面呢