单项选择题

The young man still denied ______ the fire behind the store.

A．start
B．to start
C．having started
D．to have started
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单项选择题
By the time that the guards in the building realized what was happening, the fire ______.
A．had already been put out
B．was put out
C．would have been put out
D．had put out
单项选择题
She ought to stop working; she has a headache because she ______ too long.
A．has been reading
B．had read
C．is reading
D．read
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