教室里太嘈杂了，老师不得不提高嗓门才能让学生听见他的声音。

教室里太嘈杂了，老师不得不提高嗓门才能让学生听见他的声音。
【正确答案】：It was so noisy in the classroom that the teacher had to raise his voice to make himself heard by the students.