单项选择题
New ways have been found to prevent the river______.
A.not to be polluted
B.against polluting
C.from polluting
D.from being polluted
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单项选择题
Problems like this ______ every day in the factory.
A.raise
B.rise
C.get
D.arise
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单项选择题
You can't afford to let the situation get worse. You must take ______ to put it right.
A.decisions
B.directions
C.sides
D.steps
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