单项选择题

Dr. Bruce will first give you a summary of the situation and then discuss it ______.

A．at interval
B．at random
C．at issue
D．at length
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单项选择题
Something is wrong with your truck. You'd better have it ______.
A．repairing
B．repair
C．repaired
D．to be repaired
单项选择题
The ______ horse ran away from the fire.
A．having frightened
B．frightening
C．frightened
D．frighten
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