I_at home yesterday.A,am.B,was.C,his.

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I_athomeyesterday.A,am.B,was.C,his.I_athomeyesterday.A,am.B,was.C,his.I_athomeyesterday.A,am.B,was.C

I_at home yesterday.A,am.B,was.C,his.
I_at home yesterday.A,am.B,was.C,his.

I_at home yesterday.A,am.B,was.C,his.
选B
因为yesterday表明,全句是过去时态

yesterday
过去式排除A,
I是单数用was

was.昨天在家.所以是过去式.