山西省盐业公司:英语问题

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句型转换
1. Xiaoling swam as fast as Meihua.(改为否定句)
Xiaoling__________so fast as Meihua.
2.They had a good time the day before yesterday.(改为一般疑问句)
__________they _______ a good time the day before yesterday?
3.The Young Pioneers wrote three to the old scientist(对化线部分提问)
__________ _________letters ______the Young Pioneers________ to the old scientist.