对their提问用单数还是复数
用who提问,be动词用单数还是复数
a tube of toothpaste 用单数还是复数提问
a tube of toothbrush 用单数还是复数提问?
lesson提问时用单数还是复数,taining是可数?
what提问时谓语用单数还是复数?
a bar of soap 用单数还是复数提问?
不可数名词在提问时用单数还是复数?
在对主语部分提问时,若主语是复数,那么be动词用单数还是复?
everyone has their own _(way) of relaxing在这里way 用单数还是复数
their own 后加单数名词还是复数名词?
diary用复数还是单数?
英语翻译用单数还是复数?