用 I have been doing 或I have done 填空。 You have just arrived to meet a friend. She is waiting for you. You ask: __________ (you/wait) for a long time?
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用 I have been doing 或I have done 填空。 A friend of yours is a teacher. You ask: How long _________________ (you/teach)?
用 I have been doing 或I have done 填空。 Tom looks very tired. You ask:______________(you/work) hard?
用 I have been doing 或I have done 填空。 You have been looking for Mary and you have just found her. You ask: Where have you been? __________ (you/play) tennis?
用 I have been doing 或I have done 填空。 You meet somebody who is a writer. You ask: How long ___________(you/write) books?