单项选择题

Another natural ______ that contributes to the welfare of the country is water.

A．source
B．mineral
C．power
D．resource
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单项选择题
But for the accident, we ______ the task much earlier.
A．should finish
B．should have finished
C．would finish
D．shall have finished
单项选择题
Next to natural resources comes the ability to ______ them to use.
A．take
B．set
C．get
D．turn
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