题目

--- Look at the black clouds. It ______ soon.   --- Sure. If only we ______ out. A. is raining; didn’t come B. is to rain; won’t start C. will rain; haven’t started D. is going to rain; hadn’t come 答案:D 解析: 表示“天将下雨”常用It’s going to rain。If only...表示“但愿……”;如果表示与过去的事实相反,句中谓语动词常用过去完 成时态。
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