when I boarded the train, I could not help noticing that a great many local people get on as well.
请问老师这里的when是副词引导从句还是两个并列句呢,如何区分when在这两种用法呢
如果是从句的话,能否省略为 (When) boarding the train , I ...,这里的when是不是也可以省略呢
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