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
I wanted to know when they ______ come to see me.
A． will
B． would
C． should
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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