单项选择题

There were altogether 258 passengers on ______ the plane when it crashed into the mountain.

A．broad
B．board
C．abroad
D．aboard
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单项选择题
It is always satisfying to do something that no one else ______.
A．did
B．does
C．had done
D．has done
单项选择题
The mayor ______ the citizens that the prevailing of the disease would be under control soon.
A．assured
B．ensured
C．insured
D．secured
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