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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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
单项选择题
Do you know that woman ______ black
A．with
B．on
C．in
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