Yesterday I-my mother clean the house
问题描述:
Yesterday I-my mother clean the house
答
填help
答
yesterday是过去时的标志词,所以应填help
答
Yesterday I(helped) my mother clean the house.
昨天我帮我妈妈打扫房子.
此 helped 为过去式.
答
helped
因为是昨天,过去时嘛