该内容是考试会涉及到的知识点，北京张博士医考中心搜集整理，请参考。

　　例句：

　　Twenty-seven students were told which pens were electrified;another twenty-seven were told only that somewere electrified.

　　翻译：

　　27名学生被告知哪些笔是带电的;另外27名学生仅被告知其中一些笔是带电的。

　　分析：

　　本句是一个并列句。分句一是复合句，主句的主语为Twenty-sevenstudents，谓语为were told,which引导的宾语从句，作were told的宾语;该从句中，主语为which pens,谓语为wereelectrified。分句二亦是复合句，主句的主语为another twenty-seven(students),谓语为were told,that引导的宾语从句，作were told的宾语，副词only作状语，修饰were told;该从句中，主语为some,指代pens，谓语为were electrified。

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