单项选择题

It is a complicated problem().

A.strange
B. complex
C. difficult
D. unusual

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The Klondike was the scene of one of the biggest gold rushes the world has ever known.()

A. location
B. view
C. event
D. landscape

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The number of the United States citizens who are eligible to vote continues to increase().

A.encouraged
B. enforced
C. expected
D. entitled

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