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
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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
单项选择题
—Is Prof. Tate very sick —I'm afraid______.
A．so
B．this
C．that
D．to
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