摘要:15.For many years, people electric cars. However, making them has been more difficult than predicted. A.had dreamed of B.have dreamed of C.dreamed of D.dream of [解析]:B.考查时态.根据句意:许多年来.人们都一直梦想着电动汽车.然而.制造它们比想象要难得多.由此.推断此处的梦想从过去到现在.并由此延伸.目前.市场上已经有了电动汽车.所以应用现在完成时.

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