He doesn't know the answer,so he doesn't put up his hand(改为虚拟语气)If he ______ the answer,he______ _______ _______ his hand.

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Hedoesn''tknowtheanswer,sohedoesn''tputuphishand(改为虚拟语气)Ifhe______theanswer,he____________________hish

He doesn't know the answer,so he doesn't put up his hand(改为虚拟语气)If he ______ the answer,he______ _______ _______ his hand.
He doesn't know the answer,so he doesn't put up his hand(改为虚拟语气)
If he ______ the answer,he______ _______ _______ his hand.

He doesn't know the answer,so he doesn't put up his hand(改为虚拟语气)If he ______ the answer,he______ _______ _______ his hand.
If he __knows____ the answer,he__would____ __put_____ ___up____ his hand.

If he knew the answer, he would put up his hand.