句型转换。
1. It's Friday today.(对画线部分提问)
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2. We have six English lessons a week.(对画线部分提问)
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3. I can tell you at once.(改成一般疑问句)
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4. Nancy likes Science very much.(对画线部分提问)
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5. 654 minus 456 is 198.(对画线部分提问)
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