单项选择题
We are using up our natural resources too quickly and at the same time we are ______ our environment with dangerous chemicals.
A．protecting
B．saving
C．polluting
D．fighting
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单项选择题
It was recommended that they ______ for the doctor.
A．has waited
B．waited
C．should wait
D．should have waited
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单项选择题
His handwriting is ______ yours.
A．more better
B．as well as
C．much better than
D．as better as
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