--- Look at the black clouds. It soon.
--- Sure. If only we out.
A. is raining; didn’t e
B. is to rain; won’t start
C. will rain; haven’t started
D. is going to rain; hadn’t e
网友回答
A. is raining; didn’t e
B. is to rain; won’t start
C. will rain; haven’t started
(答案→)D. is going to rain; hadn’t e
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。