The teacher is writing a piece of chalk on the blackboard while the students are writing

发布时间：2020-08-16 07:58:00

The teacher is writing      a piece of chalk on the blackboard while the students are writing     ink in exercise books.         
A. with, in
B. in, with
C. in, in
D. with, with

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(答案→)A. with, in
B. in, with
C. in, in
D. with, with
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