单项选择题

Some studies confirmed that this kind of eye disease was ______ in tropical countries.

A. prospective
B. prevalent
C. provocative
D. perpetual
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单项选择题
After people have learned that magnets attract things, centuries passed ______ they took note of the fact that magnets sometimes also repel things.
A. before
B. until
C. after
D. since
单项选择题
Many farmers came to the city, ______ jobs and for all the other legendary opportunities of life in the city.
A. looking for
B. to look for
C. having looked for
D. looked for
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