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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