the policeman on duty told him that since his defeat,the ex-prime minister had gone abroad.

tell sb. that宾语从句
如果是tell sb. the truth/news/... that+说的内容 是同位语从句
从句里面加了一个since引起的原因状语从句不是双宾语吗？双宾语 tell sb. sth.原句tell后构成一个句子 算从句tell两种用法 tell sb. sth. & tell sb.+that从句