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