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
—I saw Anna in the library yesterday.—You______her; she is still abroad.
A．must not see
B．can't have seen
C．mustn't have seen
D．couldn't see
单项选择题
They are talking about the people and the things ______ they saw on their way home.
A．which
B．that
C．those
D．who
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