---Themaninchargeknewnothingaboutthedesignandallhisassistantshadnever

发布时间:2020-08-06 20:39:52

---The man in charge knew nothing about the design and all his assistants had never done any designing work before .---Oh, I'm afraid it ______ a success.A.mustn't beB.mustn't have beenC.couldn't beD.couldn't have been

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