Alice is one of the students,who,I'm sure,are proud of their English teacher.--------变成两个简单句,然后你就明白了:
===Alice is one of the students.The students are proud of their English teacher,I am sure
Alice is one of the students,who,I'm sure,are proud of their English teacher.--------变成两个简单句,然后你就明白了:
===Alice is one of the students.The students are proud of their English teacher,I am sure