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what ______foerest in our country in the ;ast ten years.

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what ______foerest in our country in the ;ast ten years.
A.has happened do B.is happened to
C.has happened at D.is happening
但是结构是be happened to sb.难道说对物就该是be happened at sth.是这样的吗?
是不是也可以说what has happened in the office
what ______foerest in our country in the ;ast ten years.
happen vi.发生, 碰巧, 偶然
v.发生, 恰巧, 偶然发现
happen to sb.(or sth.)某人(或某物)发生...
这里的has happened at 里的at 是 at foerest (在森林方面).
句意:过去十年我国的森林发生了什么情况?
当然可以说what has happened in the office,意思是"在办公室发生了什么事",办公室本身不可能发生什么事,所以不能用what has happened to .上句亦是如此.