23.Rod must be in a bad mood today.
六级词汇讲解:
情态动词must此处表示肯定的推测一定，这类肯定的推断往往是听音的关键所在。in a bad mood意为心情不好。
英语六级考点归纳
口语中常见的与mood有关的搭配还有:
be in a good mood意为心情好。如:
You are in a good mood today!
你今天心情不错啊!
be in a foul/filthy mood意为心情非常不好，情绪很糟。如:
Dont talk to Lisa. Shes in a foul mood!
别跟莉萨说话，她情绪糟透了!
be in a mood意为情绪不好。如:
Im in a real mood all day.
我这一整天情绪都不好。
be in the/no mood for sth./to do sth.意为想/不想做某事。如:
He was in the mood for a romantic walk in the woods.
他想在树林里浪漫地走一走。
I am in no mood to argue any more.
我不想再争论了。