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
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
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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