单项选择题

By the middle of the 21 st century, the vast majority of the world's population ______ in cities rather than in the country.

A. are living
B. will be living
C. have lived
D. will have lived
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He was here ______ the stroke.
A. in
B. on
C. with
D. to
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The treasury issued an order stating that ______ land purchased from the government had to be paid for in gold and silver.
A. henceforth
B. moreover
C. whereby
D. however
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