We have not stressed so frequently the importance of liaison with our own colleagues, arguing (with sometimes dubious validity)

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问题 We have not stressed so frequently the importance of liaison with our own colleagues, arguing (with sometimes dubious validity) that because it "happens all the time" it does not need to be explicitly provided.

选项 A、controversial
B、contradictory
C、doubtful
D、daunting

答案C

解析 词义辨析。动词“争论”之后的with…结构,表示以什么方式,带有什么特点。从词义上来讲,A、B、D选项分别意为“有争议的”“矛盾的”“使人气馁的”,故选C。
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