For many years, people ______ electric cars. However, making them has been more difficult that predicted.

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问题 For many years, people ______ electric cars. However, making them has been more difficult that predicted.

选项 A、had dreamed of
B、have dreamed of
C、dreamed of
D、dream of

答案B

解析 本题考查动词的时态。由“For many year”可知,这里应该用完成时态,排 除C和D。句子讲述的不是过去的事情,所以应该用现在完成时。故选B。
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