单项选择题

The policeman was regarded as a hero（）he gave his life for his country.

A. according to
B. because of
C. on account of
D. because

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It is obvious that concrete bridges are superior（）wooden ones.

A. with
B. to
C. against
D. for
单项选择题
During the past twenty years, there have been（）changes in the country.

A.permanent
B.powerful
C.imaginary
D.dramatic
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