问题补充：
-I’m afraid I can’t pass the English exam.
--Don’t worry. You study very hard. God(上帝) helps those people help themselves.
A. when
B. who
C. how
D. which
答案：
A. when
(答案→)B. who
C. how
D. which
解析：句意：我害怕我不能通过英语考试。别担心。你学习很努力。上帝总是帮助那些自主者。定语从句用来充当句中定语的成分，被修饰的名词叫先行词，连接主从句的是关系词。关系词分：1关系代词：who , whom , whose , which , that。2关系副词：where,when why 等。一般的who 用于指代人的先行词，which 用来指代物的先行词，that既可指认又可指物。关系代词在从句中作主语、宾语。该句的先行词是people,人们。引导词在从句中做主语。故选B。
