单项选择题

--Can you answer that question
--Sorry, I ______.

A．can't
B．don't
C．mustn't
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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
单项选择题
They lost their way in the forest, and ______ made matters worse was the night began to fall.
A．that
B．what
C．it
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