【单选题】The workers working day and night , the construction of the building _____ by the end of this month . prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace>
A.
will be completing
B.
will complete prefix="o" ns="urn:schemas-microsoft-com:office:office"? ?xml:namespace>
C.
will have completed
D.
will have been completed prefix="o" ns="urn:schemas-microsoft-com:office:office"? ?xml:namespace>