英语作业I'm looking after Tom today.He's been in my house_ 8:00 this morning.A.at B.for C.since D.till 为啥不选D

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英语作业I'm looking after Tom today.He's been in my house_ 8:00 this morning.A.at B.for C.since D.till 为啥不选D
英语作业I'm looking after Tom today.He's been in my house_ 8:00 this morning.
A.at B.for C.since D.till 为啥不选D

英语作业I'm looking after Tom today.He's been in my house_ 8:00 this morning.A.at B.for C.since D.till 为啥不选D
has been 是现在完成式啊