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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单项选择题
A dolphin breathes through its ______.
A．month
B．ears
C．skin
D．blowhole
单项选择题
A good title for this selection is ______.
A．The International Red Cross
B．Safety at Home and School
C．Clara Barton and the Sun
D．The American Red Cross
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