We may lose the game unless he _____to help us.A promoses B will promise C would promose D had promised 选哪个,为什么

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We may lose the game unless he _____to help us.
A promoses B will promise C would promose D had promised 选哪个,为什么

选择c,本句考察的是虚拟语气,unless后应用虚拟.此句表示对将来虚拟.