-Look at those black clouds, It ________ soon.Let’s go to the room.-Sure.If only we ________ out.A.is raining; didn’tB.is to rain; won’tC.will rain; haven’tD.is going to rain; hadn’t been
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D解析天要下雨,不是有计划的,B、C两项不可用;答语的第二分句表示后悔,意思是“要是不出来该有多好”,用虚拟语气,故选D项。