单选题 4. Which of the following italicized words indicates certainty?

A、 He might have given you more help, even though he was busy.
B、 She might have achieved greater progress, if you had given her more chances.
C、 He might have left for Beijing for I didn't see him the whole day.
D、 She might have been employed if he had been more careful.

【正确答案】 C

【答案解析】 此题考查情态动词表示对过去的推测。Might have done可以表示对过去的推测，也可以表示虚拟。判断的诀窍是，如果表示对过去的推测，那么就和过去事实接近。如果表示虚拟，就和过去事实相反。很显然，A，B，D都和过去事实相反。C和过去事实相近。