But for your timely warning, we ___have been unaware of the danger. Thank you very much!
A．shallB．mustC．will D．would
D

試題分析：句意：要不是你及時提醒，我們就不會意識到危險。非常感謝您！此處but for意為：要不是。
表示與過去的事實相反，主句用would+have done的形式。故選D。
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