WHAT__________THE FOREST OF THEUSA IN THE LAST 350 YEARS?
应该选
A .has happened to .B .is happened to .C .has happened at.D is happening
应该选哪一个呢?
人气：395 ℃ 时间：2019-12-21 21:09:21
解答
A
首先是be happened to sth.这个词构.即可排除CD
其次
由 IN THE LAST 350 YEARS可知是过去的事,所以必须用过去时
故选A
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