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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Look! It' s cloudy and wet. ______ bad weather!
A．What
B．What a
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单项选择题
Tha bag ______ books ______ mine.
A．full of; are
B．full of; is
C．full in; are
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