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 空格处的意思是:显然,这些都是影响顺利运作的因素,但潜在的问题仍有待确定。划线单词under—lying的意思是“在下面的,根本的,潜在的”。各选项的意思是: operational“操作的”;fundamental“基础的,根本的”;operating“运行的,操作的”;underneath“下面的”。
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