单项选择题

We must take precautious measures to prevent the river（）.

A.to be polluted
B.from polluting
C.from being polluted
D.from polluted

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I（）to you as soon as I get to Shanghai.

A.write
B.wrote
C.would write
D.will write

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（）compiled the first English dictionary，A Dictionary of the English Language.

A.Samuel Johnson
B.Walter Scott
C.James Boswell
D.Noah Webster