Question

（ ）The girl had a short rest and did her homework ______ she reached home.

（ ）The girl had a short rest and did her homework ______ she reached home.
A. after B. before C. when D. since
为什么选C. when不选A. after呢？

Answer 1

完成作业是在回到家后做的事情，做作业与到家之间有非常明显的先后关系。若选A答案，则发生在完成作业之前的REACH HOME 就应该使用过去完成时了。用WHEN 的意思是 小女孩一到家就完成了作业，这是 WHEN 表承接的用法，关于WHEN 表承接，转接的题目，多做相关练习，就可以找到语感。

Answer 2

如果用after的话,后面的句子一般用完成时.
那就应该是:

The girl had a short rest and did her homework after she had reached home.

Answer 3

用when是因为事情同时发生
用after语境也不对

Answer 4

因为when是问的意思，所以选他