谓语用单数还是复数6.纸和印刷术已经被应用很久了.Paper and printing______ ________ ______for ages.

来源:学生作业帮助网 编辑:六六作业网 时间:2024/12/27 04:28:58
谓语用单数还是复数6.纸和印刷术已经被应用很久了.Paperandprinting____________________forages.谓语用单数还是复数6.纸和印刷术已经被应用很久了.Papera

谓语用单数还是复数6.纸和印刷术已经被应用很久了.Paper and printing______ ________ ______for ages.
谓语用单数还是复数
6.纸和印刷术已经被应用很久了.
Paper and printing______ ________ ______for ages.

谓语用单数还是复数6.纸和印刷术已经被应用很久了.Paper and printing______ ________ ______for ages.
Paper and printing___have___ __been______ ___used___for ages.
复数,主语有两样东西.

have been used/using