单项选择题

Com originated in the New World and thus was not known in Europe until Colmnbus found it ______ in Cuba.

A．being cultivated
B．been cultivated
C．having cultivated
D．cultivating
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单项选择题
The police have installed cameras at dangerous road ______ to film those who drive through red traffic lights.
A．trenches
B．utilities
C．pavements
D．junctions
单项选择题
This kind of glasses manufactured by experienced craftsmen ______ comfortably.
A．is wont
B．wears
C．wearing
D．are worn
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