题目内容：
He learned about the program at Valley College by word _______ mouth.
A. about
B. in
C. of
D. to
参考答案：
选择题：He learned about the program at Valley College by
- 题目分类：山东第一医科大学英语3
- 题目类型：选择题
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He learned about the program at Valley College by word _______ mouth.
A. about
B. in
C. of
D. to