题目内容：
When Williams began working on his book，he ．
A．was paid $35，000 B．learned to paint
C．had already buried the treasure
D．did not know what the story would be about
参考答案：
答案解析：
单选题：When Williams began working on his book，he ．
- 题目分类：英语
- 题目类型：单选题
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B．learned to paint
C．had already buried the treasure
D．did not know what the story would be about