句型转换。
1. We visited Beijing last summer.(对画线部分提问)
_____did you visit last summer?(对画线部分提问)
2. We had an interesting holiday in Japan. (改为一般疑问句)
_____you_____an interesting holiday in Japan?
3. We spent half an hour writing it.(对画线部分提问)
_____did you spend_____it?
4. I bought presents for my friends. (对画线部分提问)
_____presents for?