在宾语从句中,宾语部分怎样区分陈述句,疑问句,和特殊疑问句?另外she doesn‘ t know————
a.how long was Nancy back b.how long Nancy was back c.how long has Nancy been back d.how long Nancy has been back 选几?这时疑问句?or?
题错了！是Do you know————最后有个For two days