第2题: [单项选择]Mike looks so sleepy in the class; he ______ up last night. A. must stay B. should have stayed C. must have stayed D. is sure to stay 参考答案:C 答案解析:[解析] 情态动词题。表示对过去某一动作行为的确定的猜测用must have done这一句型。
第17题: [单项选择]After sitting in the sun for too long my skin began to ______. A. strip B. bake C. impair D. peel 参考答案:D 答案解析:[试题分析] 本题考查动词的辨析。
[详细解答] strip;脱光……的衣服,bake:烘烤,impair:损害, peel:剥落,脱皮,只有D项的意思符合,故应该选择D。