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随堂演练
准时体验 巩固提升
Ⅰ.单句语法填空(不多于3个单词)
1．He ________ (write) just one novel so far.
答案与解析 has written so far意为“到目前为止”，是完成时态的时间状语。
2．Now that she is out of a job, Lucy ________ (consider) going back to school, but she hasn't decided yet.
答案与解析 has been considering 依据“but she hasn't decided yet”推断，L
2、ucy还在考虑这件事，要用现在完成进行时，表示动作还要连续下去。
3． More patients ________ (treat) in hospital this year than last year.
答案与解析 have been treated treat与patient是动宾关系，应用被动语态；this year是表示现在时间的状语，所以应用现在完成时的被动语态。
4．The first use of atomic (原子的) weapons was in 1945 and their power ________ (increase) enormously ever si
3、nce.
答案与解析 has been increased ever since意为“自那以来；从那至今”，要与现在完成时连用；power是increase的被执行者，所以要用被动语态。
5．Years ago we didn't know this, but recent science ________ (show) that people who don't sleep well soon get ill.
答案与解析 has shown 依据but表示的转折意义推断，后面应说明现在的状况，与几年前相对比，并且空后说明白结果，所以应用现在完成时。
6．He was hoping
4、to go abroad but his parents ________ (decide) that they won't support him unless he can borrow money from the bank.
答案与解析 have decided 依据句意推断，应当是“他父母已经打算不供给他”，所以应用现在完成时。
7．My brother is an actor. He ________ (appear) in several films so far.
答案与解析 has appeared 句中有时间状语so far，意为“迄今为止；到现在为止”，可确定用现在
5、完成时。
8．The coffee is wonderful! It doesn't taste like anything I ________ (have) before.
答案与解析 have had before应用于完成时，所以应填have had。
9．The temperature ________ (fall) to minus 3 in London and it is likely to get even colder as the day goes on.
答案与解析 has fallen/has been falling 现在温度已降到零下3度了，用现在完成时或
6、现在完成进行时。句意：伦敦气温下降到零下3度，可能还要更冷。
10．Over the past decades, sea ice ________ (decrease) in the Arctic as a result of global warming.
答案与解析 has been decreasing 由时间状语over the past decades可知，主句只能用现在完成进行时，表示“始终……”。
Ⅱ.单句改错
1．What have you been doing before you left Oxford？________
答案 have→had
2．It's a
7、 good job. Have you done it all by yourself？________
答案 Have you done→Did you do
3．It's a long time since you come to see me.________
答案 come→came
4．Alice didn't see much of Henry lately.________
答案 didn't see→hasn't seen
5．I'm glad to tell you that you passed the exam.________
答案 passed→have passed
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