单项选择题

Hotels and restaurants are an ______ part of the city; without them the city's tourist industry can not exist.

A．insignificant
B．integral
C．interior
D．inevitable
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单项选择题
The possibilities of an autumn election cannot be ______.
A．struck out
B．left out
C．ruled out
D．counted out
单项选择题
Since it is too late to change my mind, I am ______ to carrying out the plan.
A．committed
B．obliged
C．engaged
D．resolved
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