When we ____(come )in, the thief______already____(run)away.

came had run

When we _came_in, the thief_had_already_run_away.

由题意可知，第一个填过去式——came
already一般用在完成时，而第一个如果写了came，则应该用过去完成时，所以为had
因为是完成时，run-ran-run``run的过去分词还是run，所以最后一个填run

或者前句用一般现在时
when we come in,the thief has already run away

When we came in, the thief has already run away.

When we ____(come )in, the thief______already____(run)away.
came; had, run.
came 是过去的行为、动作, 而 run 又发生在came之前，即过去的过去，所以需用过去完成时．

When we ____(come )in, the thief______already____(run)away.
第一空应填CAME
第二空应填HAD RUN
因为该句是一个过去完成时,它强调的是过去的过去,在我们进来之前,贼就走了

When we ____(come )in, the thief______already____(run)away.

came;had;ran