Although it rained heavily this morning,______ of my classmates were late for school.

问题描述:

Although it rained heavily this morning,______ of my classmates were late for school.

none
根据句意,显然是转折,尽管今天早晨雨下的很大,我的同学一个也没迟到.
后面用的were,所以前面用none,一个也不.