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?
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用 I have been doing 或I have done 填空。 You meet somebody who is a writer. You ask: How many books ___________ (you/write)?
用 I have been doing 或I have done 填空。 A friend of yours is saving money to go on a world trip. You ask: How long ________ (you/save) money?
用 I have been doing 或I have done 填空。 A friend of yours is saving money to go on a world trip. You ask: How much money ________ (you/save)?
用 I have been doing 或I have done 填空。 Some friends of yours are having a party next week. You ask: How many people _____________ (you /invite)?