Oh no! We have no gas. Robert__________to fill the tank.
A could have forgotten
B should have forgotten
C must have forgotten
D might have forgotten
答案
C
解析
【翻译】哦，不! 我们没有汽油了，罗伯特一定忘记加油了。 [考点] 情态动词 【精析】C must have done表示对过去事情的肯定推测，意为“一定做了某事”，符合题 意。could have done表示“过去本可以做某事”；should have done表示“过去本应该做 某事”；might have done表示