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In 1620,about half the USA__forest.
In 1620,about half the USA__forest.
A.was covered B.was covered by
C.were filled with D.covered with
如果D选项是be covered with呢
人气:414 ℃ 时间:2020-04-04 16:42:26
解答
B
A 加个with
C 表示空间不表示平面
D 缺少谓语
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