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
No sooner had they got the goods covered up ______ it started raining hard.
A．whan
B．than
C．then
D．after
单项选择题
It' s no use ______ with him. He won' t change his decision.
A．arguing
B．to argue
C．to be arguing
D．if you argue
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