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He doesn't know the answer,so he doesn't put up his hand(改为虚

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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
If he __knows____ the answer,he__would____ __put_____ ___up____ his hand.
再问: 为什么第一个空 填的是knows 而后面是would? 时态貌似不符。 我想填 knows will put up 是否可以?