单选：Not only Tom but also I ______ interested in traveling.

选择am.原因：就近原则。在英语中存在这样一类的词组，它们连接者两个或多个人称名词主语或物体类主语，在谓语动词的选用上英语有着自己的规定，它被称为就近原则。就是说句子的谓语动词选用标准为离其最近的一个主语形式。比如：either…or,neither…nor,not…only,but…also，both…and等。例如：Either Tom or me am a good student. Is Tom either I a good student?这两个句子最好的体现了就近原则，第一个和I近，所以用am.第二个离Tom近，所以用is.同理可得该题答案。谢谢，希望能帮到你。

应选 C 主要用法就是谓语动词要遵循“就近一致原则”，Not only the students but also the teacher was invited. 不仅学生们被邀请，而且那位教师也被邀请了。
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（以下为详细用法）
“not only … but also …”是一个并列连词词组，其意思基本等于“both … and …”，但侧重点放在“but also”上，另外该词组使用时须遵守一定的规则，如要求对称，倒装及主谓一致等。以下两个句子往往被看作是欠妥或错误的：
1. *Sitting up late last night,Tom not only read the assignment but also many poems by his favourite poet.
2. *Not only the students but also the teacher were invited.
上述两句第一句欠妥，第二句是错误的，应分别改为：1. Sitting up late last night,Tom read not only the assignment but also many poems by his favourite poet. 昨晚汤姆熬至深夜，不仅看了课外作业，而且读了他最喜欢的一位诗人的许多诗歌。 2. Not only the students but also the teacher was invited