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用 I have done 或I have been doing 填空。 A: I know Simon. B: How long _________ (you/know)him?

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用 I have done 或I have been doing 填空。 You see somebody fishing by the river. You ask:__________ (you/catch)any fish?

用 I have done 或I have been doing 填空。 You meet a woman who tells you that she teaches English. You ask her: How long ________ (you/teach) English?

(多选)移动电子商务主要提供的服务有( )。

A. 娱乐
B. 金融
C. 购物
D. 交易

(多选) 目前在B2C电子商务方式中主要的支付方式有()。

A. 送货上门付款
B. 汇款方式
C. 电子支付
D. 额度消费

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