The construction of the railway ______ by the end of the next moth.A、must have b

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问题 The construction of the railway ______ by the end of the next moth.

选项 A、must have been completed
B、has been completed
C、must be completed
D、must complete

答案 C

解析

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Theconstructionoftherailway______bytheendofthenextmoth.A、musthaveb