The construction of the library_______ before the end of next month.
The construction of the library_______ before the end of next month.
A、must have completed
B、must have been completed
C、must be completed
D、must complete
【正确答案】：C
【题目解析】：C。情态动词的被动语态为：情态动词+be+done。(译：到下月底图书馆的修建必须完工)
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