More than twenty people were believed ______in the air crash.

More than twenty people were believed ______in the air crash.

题目
More than twenty people were believed ______in the air crash.
A.to have been dying B.to have died
C.to die D.to be dying
应该选B.为什么不能选C,
答案
B.to have died 已死
C.to die 要死
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