They had just reached Edinburgh ___they were ordered to return to London. A until B afterC since D when 并解释一下。
问题描述：
They had just reached Edinburgh ___they were ordered to return to London. A until B after
C since D when 并解释一下。
答
此题选D
此题考点是一个固定句型：had (just) done sth when.
翻译是：当他们被命令回到伦敦时,他们刚刚到达爱丁堡