题目内容：
The Internet barter system relies heavily on ______.（ ） 
参考答案：
答案解析：
单选题：The Internet barter system relies heavily on ______.（ ）
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Staff will now receive expenses
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根据你所听到的回答题
根据你所听到的回答题A．B) Reserving a roo B．C) Booking an air ticke C．D) Reserving a sea
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