who is [ on ] [ duty ]today?[ I ] am [ Are ]we all here?no who is not at school?I [ don't ] know.but i think heis.[ at ] [ home ] .He looks [ like ] his father.I see.不明白的再问哟,请及时采纳,多谢!...who is [ on] [ duty]today?什么意思？今天谁值日？