It is a pity that we can no longer see that species of bird--------they________ A.are dying out...

It is a pity that we can no longer see that species of bird--------they________ A.are dying out...

题目
It is a pity that we can no longer see that species of bird--------they________ A.are dying out...
It is a pity that we can no longer see that species of bird--------they________
A.are dying out
B.will die out
C.have die out
D.had die out
主要是后两项
答案
C
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