Once common throughout the Western plains, (black-footed ferrets are thought to have declined in number) as a result of the poisoning of prarie dogs, their prey.
A
B it is thought that the decline in number of black-footed ferrets is
C the decline in the number of black-footed ferrets is thought of as
D that black-footed ferrets have declined in their numbers is thought to be
E the numbers of the black-footed ferrets are thought to have declined as
The answer is A.
Complete sentence as the following:
Once (black-footed ferrets )common throughout the Western plains, (black-footed ferrets are thought to have declined .....作者: arrymin 时间: 2002-11-30 05:56
谢谢redli,你的解释非常清楚,还有cook是句子结构非常清楚,但是不是应该在从句中加上were,(once black-footed ferrets were common throughtout the western plains,.....).
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