问一道关于英语时态的问题
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问一道关于英语时态的问题
The construction of the bridge ________ by the end of next month.
A.must have been completed
B.has been completed
C.must be completed
D.must complete
我想问一下为什么不选A呢?
The construction of the bridge ________ by the end of next month.
A.must have been completed
B.has been completed
C.must be completed
D.must complete
我想问一下为什么不选A呢?
![问一道关于英语时态的问题](/uploads/image/z/17323715-11-5.jpg?t=%E9%97%AE%E4%B8%80%E9%81%93%E5%85%B3%E4%BA%8E%E8%8B%B1%E8%AF%AD%E6%97%B6%E6%80%81%E7%9A%84%E9%97%AE%E9%A2%98)
must have done 表示对过去的推断,是已经发生了的