(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
Solution:
Tense
The human beings are still believed to have entered through the Bering land bridge. Hence ‘were thought’ is incorrect. Thus, A, C, and E are incorrect.
D is awkward in use of “thought of as”.
B is the best choice.
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