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
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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
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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