答案：have rained 解析：“must have done sth.”表示对过去事情的肯定推测，“last night”是过去时间，所以用“have rained”。
（
B
）①You must have studied English for three years, ______? A. have you B. haven't you C. did you D. didn't you （
A
）②He must have had his computer repaired yesterday, ______?
答案：①B 解析：“must have studied”表示对过去情况的推测，且句中没有过去时间状语，强调动作的完成，反义疑问句部分用“haven't you”，所以选B。 ②A 解析：“must have had his computer repaired yesterday”中，“yesterday”是过去时间状语，强调对过去情况的推测，反义疑问句部分用“didn't he”，所以选A。
单项选择 （
B
）1. —Mr. Black, good morning. This is my good friend, Liu Hong. —Nice to meet you, Mr. Black. —______. A. Nice to meet you B. Nice to meet you, too C. Nice to meet you, either D. Nice meeting you, too
答案：1.B 解析：当别人说“Nice to meet you.”时，回应应该是“Nice to meet you, too.”，表示“我也很高兴认识你”，A选项缺少“too”，C选项“either”用于否定句，D选项“Nice meeting you, too.”通常用于告别时，所以选B。
（
A
）2. —Let's go and listen to Mr. Smith's speech on Western culture. —______. It's getting to the end. A. I'm afraid not B. Why not? C. That's all right D. Never mind
答案：2.A 解析：后文提到“It's getting to the end.”（演讲快结束了），说明不能去了，A选项“I'm afraid not”（恐怕不行）符合语境，B选项“Why not?”（为什么不呢）表示同意，C选项“That's all right”（没关系），D选项“Never mind”（不要紧），所以选A。
（
D
）3. —I'm truly sorry to grow too big for my bed, Mom. What should I do? —______. We're going to make a new one for you. A. That's right B. Don't mention it C. All right D. That's all right
答案：3.D 解析：孩子道歉，妈妈回应“没关系，我们会给你做一个新的”，“That's all right”表示“没关系”，A选项“That's right”（那是对的），B选项“Don't mention it”（不客气）用于回答感谢，C选项“All right”（好的），所以选D。
（
C
）4. —Math is more important to learn than English. —______. I think math is as important as English. A. Yes, I agree B. You are quite right C. I am afraid I disagree with you D. It's really so
答案：4.C 解析：后文提到“I think math is as important as English.”（我认为数学和英语一样重要），说明不同意对方“数学比英语更重要”的观点，C选项“I am afraid I disagree with you”（恐怕我不同意你的看法）符合语境，A、B、D选项都是同意对方观点，所以选C。
