many trees --- along the streets every year so the air is very fresh now
a\plantb\areplantedc\plantedd\wereplanted请您说明理由好吗?...
a\ plant
b\ are planted
c\ planted
d\ were planted
请您说明理由好吗? 展开
b\ are planted
c\ planted
d\ were planted
请您说明理由好吗? 展开
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