答案及解析：[单选题]What can be omitted when translating the sentence “the network proved to be a valuable tool for rese - 语言文学类题库- 答案窝(daanwo.com)-大学生作业答案及考资分享平台

问题：

[单选题]What can be omitted when translating the sentence “the network proved to be a valuable tool for research and communication”?
AThe noun “network”.
BThe proposition “for”.
CThe adjective “valuable”.
DThe definite article “the”.