单项选择题

This reference book______again.

A．is worth to read
B．is worthy reading
C．is worth being read
D．is worth reading
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—Is Prof. Tate very sick —I'm afraid______.
A．so
B．this
C．that
D．to
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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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