问题补充:
To make the city beautiful, a lot of flowers and trees every spring.
A. plant
B. are planted
C. planted
D. were planted
答案:
A. plant
(答案→)B. are planted
C. planted
D. were planted
解析:句意:为了让城市变漂亮,每年春天都会种很多的花和树。plant 在这里是一个动词,意思是种植。根据句意可知,每年春天都会种花,种树,所以这个句子应该用一般现在时;故排除C和D。又根据句意可知,这里的主语flowers and trees和动词plant之间是被动的关系,应该用被动语态。故选B。