2. 外语
  3. Geologists believe that the Bering land bridge, over which human beings are thought to have first entered the America, disappear

Geologists believe that the Bering land bridge, over which human beings are thought to have first entered the America, disappear

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问题 Geologists believe that the Bering land bridge, over which human beings are thought to have first entered the America, disappeared about 14,000 years ago when massive glaciers melted and caused the sea level to rise several hundred feet worldwide.
选项 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
答案A
解析 enter的动作显然发生在think之前，应用动词不定式的完成时，而仅有A满足此要求。
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