单项选择题

Jack（）yet, otherwise he would have telephoned me.

A．mustn't have arrived
B．shouldn't have arrived
C．can't have arrived
D．need not have arrived

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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
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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