目前中国卖家可以在以下（）平台上进行创业。
A.亚马逊
B.EBAY
C.速卖通
D.Wish
参考答案：A, B, C, D
3. He is teaching in his hometown now, but he________ in a hospital for 10 years.
A．worked
B．has worked
C．had worked
D．has been working
3， 6， ( )， 21， 33， 48
A．9
B．12
C．15
D．18
