答案选B.过去完成时的使用条件是很苛刻的,只有在出现过去式的情况下,才能再用过去完成时表示过去的过去,在这个句子中是站在现在一般时态这个角度来叙述的.由于开头有For many years这个一段时间,故用完成时表示状态,排除A,故选B
For many years,people _____ electric cars.Howe
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