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
--Your city looks beautiful!--Yes. Lots of trees and grass ______ last year.
A． were planted
B． have been planted
C． planted
单项选择题
Tom's mother kept telling him that he should work harder, but ______ didn't work.
A． he
B． it
C． which
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