初二英语选择题!!!!急急急!要求解释

来源：百度知道编辑：UC知道时间：2024/09/20 02:29:35

They their books before the bell rang .So they had to look for them after school
空白处选择
A. don't find B.haven't found C.didn't find D.hadn't found

选D。
They (hadn't found) their books before the bell rang.
“在铃响前他们仍然没有找到他们的书。”
在过去的时间点以前，仍然没找到书；说的是过去的过去，用过去完成时。

d，有两个过去动作的相互比较就要用过去完成时

D，found是bell rang之前的动作，就是“以前的以前”，所以用过去完成时

选D。