单项选择题

When the students came into the classroom, the teacher ______ on the blackboard.

A．was writing
B．is writing
C．wrote
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--Can you answer that question--Sorry, I ______.
A．can't
B．don't
C．mustn't
单项选择题
--Would you like a bottle of mineral water
A．Yes, I will
B．No, please
C．No, thanks
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