单项选择题

A large unidentified object was spotted floating in the sea near our ship.

A．unexpected
B．unknown
C．unusual
D．unpacked
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单项选择题
One minute Rosemary was by my side, the next she had vanished into the crowd.
A．left
B．stepped
C．disappeared
D．arrived
单项选择题
The organization's sole concern was to collect money for blind and deaf children.
A．only
B．vital
C．minor
D．public
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