首先这个句子的意思是“困扰他们的是——足够的机床”
那么可以知道空格肯定是说他们“没有”的意思啦
然后这个句子是个从句,但是从句中已经有谓语动词“is”了,后面需要跟的动词应该是动名词形式,所以选not having
what's troubling them is _______ enough machine tools
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