单项选择题

The boy knew everything ______.

A．the moment he was asked to stay behind
B．when the teacher started talking about honesty
C．only some time later
D．when he was walking out of the room

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单项选择题

The thing(s) emphasized in her talk was (were) ______.

A．honesty
B．sense of duty
C．seriousness
D．all of the above

单项选择题

The teacher saw all this, so she asked the boy ______.

A．to go on writing his paper
B．to stop whispering
C．to leave the room immediately
D．to stay behind after the exam