单选题：The work they are doing is __________ great value.

题目内容：

The work they are doing is __________ great value. A． in
B． of
C． by
D． from

参考答案：

答案解析：

{MP3:http://wximg.233.com/NewsFiles/2011-9/24/6.mp3}Hello, J

{MP3:http://wximg.233.com/NewsFiles/2011-9/24/6.mp3}Hello, Jane. Nice to meet y

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