单选题 At first they worried about the situation but things ______ quite satisfactory.

【正确答案】 C
【答案解析】work out“进展。进行”,表示结果,常与well,badly,satisfactory等词连用。go on表示“进行”时强调过程,如:What's going on there?(那里发生了什么事?);carry on“继续,从事”,try out“试验”,均不符合题意。