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By the end of this year, a new library ________ in our schoo

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By the end of this year, a new library ________ in our school.
A would be completed                                           B will have been completed
C had been completed                                             D was being completed
B

考查时态。By与完成时连用,the end of this year是一个将来的时间,使用将来完成时。句意:到今年年底,一座新的图书馆在我们学校将已经被建立。