问题补充：
The old couple has a lot since their only son was killed in an accident two years ago.
A. looked through
B. gone through
C. got through
D. passed through
答案：
A. looked through
(答案→)B. gone through
C. got through
D. passed through
解析：look through 浏览 go through 经历，经受 get through 通过，完成，接通电话。
Pass through 经过, 通过“这对老夫妇经历了很多痛苦自从两年前他们唯一的儿子在事故中死亡。”
