【題目】What the forest of the USA in the last 350 years?

A. has happened to B. is happened to

C. has happened at D. is happening

【答案】A

【解析】解析過程:考查現(xiàn)在完成時的用法。句意:在過去的350年里,美國的森林發(fā)生了什么?過去發(fā)生并且已經(jīng)完成的動作對現(xiàn)在造成影響或后果,過去某一時間開始并一直持續(xù)到現(xiàn)在的動作或狀態(tài)。發(fā)生什么事了用介詞to 。故選A。

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