单项选择题

Mr. Yang,（）for his famous invention, was invited to give a lecture in the technical university.

A. was known
B. knowing
C. was knowing
D. known

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单项选择题
The population of India is much larger than（）of Sweden.

A. that
B. such
C. what
D. so
单项选择题
Some animals（）well enough in that country.

A. have not protected
B. is not being protected
C. are not being protected
D. are not protecting
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