If it had contented our pristine ancestors to dwell in caves or to lead
their nomadic life, they would have remained some mere vagabond creatures.老师字典短语是lead a ...life,为什么lead their life这种形式也存在,不用复数嘛?
We are investigating complaints from customers about goods not being properly inspected before leaving the factory.not being...是什么用法,是现在分词短语作定语修饰goods吗?还是其它用法?
听力里面的句子:And how strong is the evidence that climate change is happening that it's really something we need to be worried about?请问happening后面的that引导的是什么从句?