单项选择题

Certain pine trees are deliberately dwarfed for______ purposes.

A．constructive
B．dimensions
C．ornamental
D．decorated
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单项选择题
The teacher asked a very difficult question, but finally Ted______ a satisfactory answer.
A．came with
B．came up
C．came up with
D．came up for
单项选择题
The barrier of language keeps many scientists in prolonged ignorance of work of immediate importance to them ______at present in many countries.
A．doing
B．to be done
C．having done
D．being done
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