问题补充:
We should plant more trees on sides of the street.
A. either
B. both
C. all
D. each
答案:
A. either
(答案→)B. both
C. all
D. each
解析:句意:我们应该在街道的两边多植树。Either两者当中的一者,both两者都;all都,全部;each每一。Sides是复数名词,另根据常识街道有两个边,所以选B。
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