What's troubling them 是这句话的主语,is是句子的谓语动词,而be动词为系动词,后面跟的是表语,应当是表语从句,表语从句的引导词that是不可省略的.（如果句子中的谓语不是BE动词,则后面跟的句子就是宾语从句了）
What's troubling them is____enough experienced workers.为什么不能
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相关问题
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what's troubling them is _______ enough machine tools
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what's troublling them is () enough machine tools.
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What a lot of trouble he is causing 这里的 trouble 为什么不是复数 加 S
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What's your trouble对,为什么What's your matter不对?
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This is a serious accident （ ） by an experienced worker?
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if you know what the trouble is,why don't you help them to _
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英语语序问题what's the trouble?变为What the trouble is,因为what提问的是原句的
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问你怎么了是“What's your trouble”还是“What's the trouble ”
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what is your trouble?
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That is what's called cumulonimbus 为什么不是what cumulonimbus is