问题
选择题
---What made him so angry?
--- _______.
A．Because his son escaped from school
B．His son’s escaping from school
C．His son escaped from school
D．What his son escaped from school
答案
答案：B
四个选项分别表示因为他的儿子逃学了,他儿子的逃学问题、他的儿子逃学了，选项D不和语法。其中选项B动词的现在分词，指的是他的儿子不止一次逃学，最符合题意，故选B。