问题
选择题
The mayor is happy to find that many trees _______ in our city last year.
A．plant
B．were planted
C．planted
D．are planted
答案
答案：B
句意：市长很高兴地了解到去年我们城市种了很多树。many trees与plant之间存在被动关系，故用被动语态，再由时间状语last year“去年”可知时态为一般过去时，故选B。