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

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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
单项选择题
The boy's father bought him a large toy train（）

A．to play with
B．to play with it
C．which to play with
D．at which to play
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