选择题 Nancy’ s gone to work but her car’ s still there. She_____ by bus.
【正确答案】 A
【答案解析】句意: Nancy去上班了但她的车还在这, 她一定是坐公交走的。 本题考查虚拟语气的几种情况。 must have done表示肯定的猜测。 should/ought to have done本应该做。 could have done本可以做。