He looks so happy.Maybe he ___ he won the first prize.

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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）

是C,一般来说,一个句子中,不会前面是现在时,后面又是过去时.
现在完成时,一种是强调过去对现在的影响吧,另一种指动作从过去延续到现在,也就是经常说的延续时.
其实,一个单独的句子,用过去时,和现在完成时都无所谓,但如果具体语境中,前面是现在时,一般就用现在完成时了,除非有明显的表示过去的词语.
ps.在美式英语中,完成时都是用过去时表示的.

He looks so happy.Maybe he ___ he won the first prize. he won the first prize in the speech competition without ___ He was the first one who won the prize He won first prize 为什么不加the He won the first prize in his group(同义句) he won first prize in his group He got the first prize,_____ made us very happy. He hopes( )the first prize. He heard that he won the first prize which made him much---- 英语翻译主语从句翻译：that he won the first prize is surpeising.that he he was proud of ( ) the noble prize.a.he having won b.his so Danny is so happy that he looks( )on the train.