The dinosaurs probably became extinct after a giant asteroid hit the Earth about

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问题 The dinosaurs probably became extinct after a giant asteroid hit the Earth about 65 million years ago. But what______if this asteroid______?

选项 A、would have happened: had missed
B、would happen: missed
C、happened: would miss
D、was happening: missed

答案 A

解析句意：六亿五千万年前，恐龙很可能是在一颗行星撞击地球之后灭绝的。但如果行星没有撞击地球，情况又会是什么样呢?考查虚拟语气，表示与过去事实相反主句用would have done，从句用过去完成时表示。

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