2017-2018学年人教版必修2 Unit3 Section Ⅲ练习含解析 5.They have sold out all the books in the bookshop. Ⅱ.用所给动词的正确形式填空 1.First as a PC and then as a laptop, I ________(use) in offices and homes since the 1970s. 2.Over time my memory ________(develop) so much that, like an elephant, I never forget anything I ________(told). 3.Since the 1970s many new applications ______(find) for the computer. 4.I have also ________(put) into robots and used to made mobile phones as well as help with medical operations. 5.I have even ________(put) into space rockets and sent to explore the Moon and Mars. 答案: 1.have been used 2.has developed; have been told 3.have been found 4.been put 5.been put
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