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 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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