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Geologists believe that the Bering land bridge, over which human beings are thought to have first entered the Americans, disappeared about 14,000 years ago when massive glaciers melted and caused the sea level to rise several hundred feet worldwide.
(A) are thought to have first entered
(B) were thought first to enter
(C) were thought at first to enter
(D) are thought of as first entering
(E) were thought to first enter

KEY: A 我想请问一下 为什么E不对, 虽然我看过  之前的讨论  但是我有一个很大的疑问   就是現在完成是不是因该有"持续到現在"的意思吗

但是我觉得  這一句话沒有阿????

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拙见。我觉得这句话说 are thought to enter也是可以的。 除非说have entered限定了这个词是发生在过去的。可是有这么一说么?请NN给举个例子,谢谢

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mnay   thanks !!!

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这里是现在完成式的"已完成"用法:动作或过程发生在说话之前某个没有明确说出的过去时间,现在已经完成了,并与现在的情况有联系.

E.g.:He's turned off the light.

"持續到現在"是另外一种"未完成"的用法:

E.g.He's lived here since 1960.

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