考点：宾语从句

句子：

Over the past few weeks, we've been working to understand exactly what happened with Cambridge Analytical and taking steps to make sure this doesn't happen again.

解析：what引导宾语从句，做understand的宾语；and 连接working和taking同时与have been 一起构成双谓语，主语是we，句子主干为“we've been working to...and taking steps to...”；this doesn't happen again为宾语从句，做形容词sure的宾语，省略了that。

参考翻译：在过去的几个星期里，我们一直在努力了解剑桥分析公司到底发生了什么，并采取措施确保这种情况不会再次发生。

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