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课时提升作业(二) 必修1 Unit 2 (建议用时30分钟) Ⅰ. 单项填空 1. Knowledge and learning are important if we want to be successful but they may also ________ our thinking. A. directB. limitC. changeD. improve 【解析】选B。考查动词词义辨析。句意: 如果我们要想成功, 知识和学问是重要的, 但是它们也可能限制我们的思考。direct指引, 指导; limit限制; change改变; improve提高。根据句意选择B项。 2. —Alice, you are supposed ________ part in the party in time. —Sorry, but I had an unexpected visitor. A. to take B. to have taken C. to be taking D. taking 【解析】选B。句意: ——爱丽丝, 你本应该及时参加晚会。——对不起, 我临时有客人来访。be supposed to have done表示“本该做某事, 但实际未做”, be用一般现在时。 【加固训练】 (2017·苏州模拟)—He hasn’t finished his work yet. —Well, but he is ________ . A. supposed to do B. supposed to have C. supposed to D. supposed to be 【解析】选B。句意: ——他还没有完成工作。——嗯, 他本应该完成的。答句是省略结构, 完整形式为: Well, but he is supposed to have finished his work. 。变式题和原题的共同点是在对话中设题。区别在于: 原题中be supposed to have done用于完整的句子中, 而变式题中采用省略结构, 在省略的不定式结构中如含有助动词have, 要保留have。本题难度要大于原题。 | 
