单项选择题

A．In a building.
B．In a tree hole:
C．in a cave.
D．All of the above.
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填空题
Wheels work well on flat surfaces, but are ______.
单项选择题
A．She had not completed her assignment.B．She was unable to attend her psychology class.C．She felt embarrassed in class.D．Her presentation received a poor grade.
A．She had not completed her assignment.
B．She was unable to attend her psychology class.
C．She felt embarrassed in class.
D．Her presentation received a poor grade.
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