C
不定式短语作后置定语,表被动,表将来
等于 that is to be completedwill becompleted 为什么不行注意把整个状语从句看完， 谓语是【is delayed】, 如果你选 will be completed 不又冒出个谓语了？！ 那后面的is delayed 是什么？当然也可以改一下：If the work 【that/ which】_will becompleted _by the end of the month is delayed在work 后加个that / which 把will becompleted 看成定语从句中的谓语，这就OK 了。 明白？