In 1937 . . . . . . . . explorer Sir Hubert Wilkens set out to search for . . . . . . . . Soviet airman whose plane had gone down over . . . . . . . . North Pole.
A. no article, a, the
B. the, no article, no article
C. no article, the, no article
D. the, a, the
Answer: Option D

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