Obviously these are all factors affecting smooth operation, but the underlying problem is still to be identified.

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问题 Obviously these are all factors affecting smooth operation, but the underlying problem is still to be identified.

选项 A、operational
B、fundamental
C、operating
D、underneath

答案B

解析 本题中,underlying的意思是“在下面的,根本的,潜在的”。四个选项中,fundamental的意思是“基础的,根本的”,如:a fundamental difference between their aims(他们目标的根本差异)。operational的意思是“操作的”;operating的意思是“运行的,操作的”;underneath的意思是“下面的”。只有B项符合题意。
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