Today is my sister's birthday She ___ (cut) her brithday cake now_英语解答

Today is my sister's birthday She ___ (cut) her brithday cake now

人气：274 ℃　时间：2019-10-08 17:55:38

解答

is cutting能讲讲吗？有now说明是现在进行时，she第三人称单数be动词用is