[单项选择]He seemed to be a lot more cheerful and appeared to ______ from his bout of depression of the previous evening. A. be recovered B. have recovered C. be recovering D. having recovered
参考答案:B 答案解析:该题中appear to have done sth是个固定的表达，意思是“看上去干了某事”，to不定式用完成体形式主要原因在于其动作先于系动词appear而发生。
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第1题: [单项选择]《乡愁》是诗人（）的作品。 A. 舒婷 B. 余光中 C. 卞之琳 D. 于坚 参考答案:B
A. ought to come B. should come C. must have come D. should have come 参考答案:D 答案解析:[精解] 基础语法知识题。此处涉及虚拟语气的用法，如果主句和从句的谓语动词指不同的时间，这时需要用混合虚拟语气。一般来说，在这种情况下，主从句谓语动词指代的时间不同，所以我们又可以错综时间条件句，在这
