单项选择题

How the fire in the dancing hall started______a mystery.

A．to remain
B．remains
C．remain
D．is remaining
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单项选择题
All my neighbors tried to help in some way. But they turned out to be actually______ the way.
A．in
B．on
C．with
D．beyond
单项选择题
The middle-aged man was seen______out of the house on the afternoon of the murder.
A．came
B．come
C．to come
D．have come
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