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![英语题 需解释The construction of the laboratory _ by the end of next monthA must be completed B.musthave been completed C.will be completed D.will have been completing其他的怎么排除的答案是aD怎么错了???](/uploads/image/z/1341545-41-5.jpg?t=%E8%8B%B1%E8%AF%AD%E9%A2%98+%E9%9C%80%E8%A7%A3%E9%87%8AThe+construction+of+the+laboratory+_+by+the+end+of+next+monthA+must+be+completed+++B.musthave+been+completed+C.will+be+completed+++D.will+have+been+completing%E5%85%B6%E4%BB%96%E7%9A%84%E6%80%8E%E4%B9%88%E6%8E%92%E9%99%A4%E7%9A%84%E7%AD%94%E6%A1%88%E6%98%AFaD%E6%80%8E%E4%B9%88%E9%94%99%E4%BA%86%EF%BC%9F%EF%BC%9F%EF%BC%9F)
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