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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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
The bag ______ books ______ mine.
A．full of; are
B．full of; is
C．full in; are
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