1．For many years，people __ electric ears．However，making them has been more difficult than predicted．（　　）
A．had dreamed ofB．have dreamed ofC．dreamed ofD．dream of

分析 多年以來，人們一直夢(mèng)想擁有電子耳朵，然而，電子耳朵的制造遠(yuǎn)比預(yù)期的要難得多．

解答 答案B．for+段時(shí)間 做狀語，后面常用完成時(shí)態(tài)，所以排除了CD．因?yàn)橐恢币詠矶际?想要有"，現(xiàn)在還是"想要"，所以用一般完成時(shí)，不用過去完成時(shí)，過去完成時(shí)表示過去的過去就已經(jīng)完成的動(dòng)作．所以就選B．

點(diǎn)評(píng) 時(shí)態(tài)題的考查關(guān)鍵是抓住句子的上下文含義和句中的時(shí)間狀語．要根據(jù)時(shí)間狀語來選擇合適的時(shí)態(tài)，在平時(shí)的學(xué)習(xí)中要注意積累有關(guān)時(shí)態(tài)的用法和各種時(shí)態(tài)的特殊之處．

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