单项选择题

Only recently ______to deal with the environmental problems.

A．something has done
B．has something done
C．has something been done
D．something has been done
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单项选择题
Without heat and sunlight, plants on the earth______ well.
A．would not grow
B．will not grow
C．had not grown
D．would not be grown
单项选择题
By next year he______ in New York for five years.
A．has worked
B．has been working
C．works
D．will have worked
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