单项选择题

—How can I clean my coat
—You ought to have your coat______.

A．clean and press
B．cleaned and pressed
C．cleaning and pressing
D．cleaning and pressed
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单项选择题
The water at the bathing beach became______by refuse from the factory.
A．pollute
B．polluted
C．polluting
D．being polluted
单项选择题
—My baby has a heart trouble. —Did the doctor find it difficult______.
A．in treating
B．treating
C．for treating
D．to treat
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