He has been a doctor for 3 years.
2. She hasn't got here.
3. Have you been to London? No, I haven't.
4. What have you done since 8 o'clock? I've finished all the homework.
造几个现在进行时的句子肯定句.否定句.一般疑问句(要有肯否定回答)、特殊疑问句(回答
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