They are very tired after a day's hard work.同义句是 They are all in（） after a day’s hard work.填空补充括号缺的词

They are very tired after a day's hard work.同义句是 They are all in（） after a day’s hard work.
填空补充括号缺的词

They are all in GREAT FATIGUE / TIREDNESS after a day’s hard work.

exhaustion
fatigue
二者都是名词，用在这儿都可以，表示疲惫的意思