选择题

Nancy's gone to work but her car's still there. She________ by bus.

A、 must have gone
B、 should have gone
C、 ought to have gone
D、 could have gone

【正确答案】 A

【答案解析】

句意：南希已经去上班了，但她的车还在那里。她肯定是坐公交车去的。 must have done表示肯定的猜测。 should have done和 ought to have done都表示本应做而没做。 could have done表示不太确定的猜测。根据上一句的语境，可断定是肯定的猜测，A 项为正确选项。