单项选择题

The old man walked slowly, stopping frequently ______

A．on rest
B．at rest
C．resting
D．to rest
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单项选择题
The speed ______ is 340 meters per second.
A．at which sound travels
B．with which sound travels
C．of which sound travels
D．for which sound travels
单项选择题
______ at the door before you come into the room.
A．Hit
B．Knock
C．Touch
D．Strike
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