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In a few years` time,millions of trees those mountains
In a few years` time,millions of trees _________(cover) those mountains
为什么不能是have covered
人气:339 ℃ 时间:2020-03-27 02:04:52
解答
is covering
因为树始终还是覆盖这山
而have covered说明树以前是覆盖的
但现在不再覆盖山了
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