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Geologists believe that the Bering land bridge, over which human beings are thou
Geologists believe that the Bering land bridge, over which human beings are thou
游客
2024-01-13
19
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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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