He came into the classroom ________ I was cleaning the teach

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He came into the classroom ________ I was cleaning the teacher's desk．
A.after
B.before
C.when
D.while

答案D
首先看前后句的意思,was cleaning强调的是“正在……的时候”,没有表示前后顺序的用法,可以排除A和B；而在表示时间的状语从句中,while用于有过去进行时的从句,强调动作同时发生,比when更合适；when一般用于连接两个一般过去时的句子；after/before用于表示动作发生的前后顺序．

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