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The young in spirit ______ the vital forces in our society.

A. is
B. are
C. has been
D. have been
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单项选择题The United States must look out for the rights of ______ citizens.

A. its
B. their
C. our
D. we

单项选择题The government ______ best to boost production.

A. are doing its
B. is done its
C. are done their
D. is doing its