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
A.after
B.before
C.when
D.while
![He came into the classroom ________ I was cleaning the teach](/uploads/image/z/8720836-52-6.jpg?t=He+came+into+the+classroom+________+I+was+cleaning+the+teach)
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.
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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