He looks so happy.Maybe he ___ he won the first prize.A.konws B.knew C.has known到底是B还是C?为什么?我一直在纠结是该 过去式 还是 现在完成时.顺便解释下,什么时候用现在完成时（没有给提示词的情况下）

Danny is so happy that he looks( )on the train. he looks so happy,maybe he(选什么）he wonthe first prize He looks so cool. He looks at me ----(happy) He looks _________and he looks __________(happy)at me. he looks happy 和 he look happy有什么分别 He looks happy改为过去时 He looks very happy的句子结构 no wonder she looks so happy中,she looks so happy是同位语从句吗? He looks happy today对happy划线提问 he looks _.he is looking_（happy） he looks so cool____his new jeans 英语翻译why is everybody looks so happy还是why is every looked so happy Jim does morning exercises every day,so he looks very < >A tired B good C well D happy请说明理由! so he w___ happy下一局 用所给词的适当形式填空. The boy looks ()[happy] at his mun.He looks ()[happy]. He works hard,so he looks bad.句型转换————work hard ,so he looks bad. He looks happy.改成一般疑问句下划线在happy那怎么改