问题
选择题
--- 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
答案：D
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。