1.Mr.Ford has just arrived,but I don't know he ____ until ye

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1.Mr.Ford has just arrived,but I don't know he ____ until yesterday.
A.will come B.was comeing C.comes D.had come
正确答案是B 为什么?
2.Sorry,I____you ___for me.
A.don't know; are waiting B.didn't know; are waiting
C.don't know; were waiting D.didn't know; were waiting.
正确答案是C,为什么?
3.She ___her mother's work since she was admitted into hospital.
A.is doing B.has been done C.has done D.has been done
正确答案是C,为什么?

1.B选项应该是coming（什么辅导书.- - #这个都错了）,如果选项里有came,也可选came,首先要选过去时态的（排除A,C）,不能用完成时,所以排除D,选B
2.过去进行时表示过去正在进行的动作,我不知道你（过去,现在没等了）一直在等我
3.现在完成时表示持续到现在的动作,后面有个since,表示自从获准进入医院后就一直在做她妈妈的工作

1.Mr.Ford has just arrived,but I don't know he ____ until ye mr ford has just arrived,but i didn't know he [ ]until yeste James has just arrived,but I didn't know he ____ until yeste James had just arrived ,but I didn't know he ______ until ye Tom has just arrived,but I didn't know he ___ until yesterda James has just arrived,but I didn't know he _____ until yest James has just arrived.but i didn't know he 【】until yesterd James has just arrived,but I didn't know he came until yeste 1.James has just arrived,but I didn't know he ____until yest 一道英语单选Tom has just arrived today,but I didn’t know he ____ u james has just arrived,but i didn't know he __until yesterdy Jams has just arrived,but I didn't know he __until yesterday