问题
__________ volunteers will be needed for 2014 International Horticulture Exposition (国际园艺博览会) in Qingdao.— Let’s go and join them.
A:Thousand
B:Thousandsof
C:Three thousand of
D:Thousands;
B:Thousandsof
C:Three thousand of
D:Thousands;
正确答案是：
