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
Mike ______ seventeen years old tomorrow.
A. will be
B. shall be

C. is going to be
单项选择题
The students enjoyed ______ with each other in English.
A. to talk

B. talking

C. have a talk
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