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it's expected that the new highway____completed by next july

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it's expected that the new highway____completed by next july.
A.would be
B.will have been
C.has been
D.had been
为什么选B而不选A呢,
考将来完成时,by next July是到明年七月这条高速路就建成了,所以用将来完成时.如果是考这种时态或者过去将来完成时,一般会有一个"by"的介词短语.