问题
选择题
The environment in our town is getting worse and worse, so many trees _______. [ ]
A. are planting
B. should be planted
C. should plant
D. will plant
答案
答案：B
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The environment in our town is getting worse and worse, so many trees _______. [ ]
A. are planting
B. should be planted
C. should plant
D. will plant
答案：B