cars play an important role in modern life,but they ___also cause many problems like air pollution.A can B should C would D need选什么 为什么~

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cars play an important role in modern life,but they ___also cause many problems like air pollution.A can B should C would D need选什么 为什么~

cars play an important role in modern life,but they ___also cause many problems like air pollution.A can B should C would D need选什么 为什么~
cars play an important role in modern life,but they ___also cause many problems like air pollution.
A can B should C would D need
选什么 为什么~

cars play an important role in modern life,but they ___also cause many problems like air pollution.A can B should C would D need选什么 为什么~
选A吧
A表示可能,是一种推测,解释起来也通的
B表示应该,意思不对;这里又不是虚拟语气,所以不用should
C可以表示推测,是可能性很小的那种,语气比较委婉的,在这里用would不合适
D表示需要,意思就不对,用法也不对,need做实义动词后面加to do,用作情态动词才可以直接加do,可是只有否定或疑问句里才能看成情态动词,所以不对的

A
表示可能 can好像有这么一种用法, 我做题,这种时候选can,基本都对
B应该,不妥
C前后时态大概不对
D不对

A 表可能性