问题标题：
【27)Theconstructionofthelaboratory____bytheendofnextmonth.A)mustbecompletedB)musthavebeencompletedC)willbecompletingD)willhavebeencompleting】
问题描述：
27)Theconstructionofthelaboratory____bytheendofnextmonth.
A)mustbecompleted
B)musthavebeencompleted
C)willbecompleting
D)willhavebeencompleting
韩军回答：
Theconstructionofthelaboratory_B___bytheendofnextmonth.A)mustbecompletedB)musthavebeencompletedC)willbecompletingD)willhavebeencompleting----"byendof+将来时间",动词用“将来...
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