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
The general's command was that the soldiers ______ their fort and carry out more important tasks.
A．would leave
B．leave
C．left
D．have left
单项选择题
Something must have happened on their way here. Or they ______ by now.
A．should have arrived
B．should arrive
C．would have arrived
D．would arrive
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