单项选择题

More than one man ______ been sent to the hardest place since 1979.
A) has B) have C) had D) is

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We are studying English hard ______ our country better in the future.
A. serve
B. to serve
C. serving

D. served
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It was the holding of the APEC conference______made Shanghai the focus of the world.
A) that
B) which
C) what
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