【答案解析】[解析]
He didn't use to play basketball, did he?
[解析] 原文：He didn't use to play basketball, did he? 这是个反意疑问句，回答时要根据实际情况进行回答，如果与事实相符，就用Yes, he did; 如果与事实不符，就用No, he didn't. 选项[A]No, he didn't. 符合题意。
单选题
A. Writing letters.
B. Reading letters.
C. Sending letters.
【正确答案】
C
【答案解析】[解析]
What are stamps used for?
[解析] 原文：What are stamps used for? 邮票是干什么用的?根据常识可知，邮票是寄信用的。选项[C]Sending letters. 符合题意。
单选题
A. Yes, I do.
B. No, I don't.
C. No, never.
【正确答案】
C
【答案解析】[解析]
Have you ever studied with a group?
[解析] 原文：Have you ever studied with a group? 这是现在完成时的一般疑问句，回答也要用现在完成时来回答。选项中只有[C]No, never. 符合题意。
单选题
A. I prefer cooking to eating.
B. I prefer eating to cook.
C. I prefer drink to eating.
【正确答案】
A
【答案解析】[解析]
What do you like better?
[解析] 原文：What do you like better? prefer...to...意为“喜欢……不喜欢……”，prefer和to后面要用相同形式的词，选项中只有[A]I prefer cooking to eating. 符合题意。
单选题
A. I have learned English for five years.
B. I began to learn English last year.
C. I'll learn English in about three years.
【正确答案】
A
【答案解析】[解析]
How long have you studied English?
[解析] 原文：How long have you studied English? 对一段时间进行提问，回答时应用表示一段时间的词来回答，选项A符合题意。