单项选择题

Dont (hesitate) to let me know if there is anything I can do for you.

A．pause
B．refuse
C．reject
D．wait
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单项选择题
The train stopped (abruptly), making us wonder where we were.
A．all of a sudden
B．fast
C．quickly
D．slowly
单项选择题
The boy was seriously (wounded) in the accident.
A．damaged
B．injured
C．destroyed
D．devastated
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