The teacher is writing ____a piece of chalk on the blackboard while the students are writing ____ink in exercise books.A with,inB in withC in,inD with,with

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• 10英语的介词选择题请问选什么?为什么?（主要是为什么,因为我有答案）(1)The teacher is writing ___a piece of chalk on the blackboard while the student are writing ___ink in exercise books.[A]with/in [B]in/with [C]in/in [D]with/with(2)Mary dropped in___Mr Smith,but he wasn't at home ,so she went to drop in ___Mr Smith's office.[A]on/on [B]at/at [C]on/at [D]at/on(3)The teacher is not only strict___his pupils but also strict___his own work.[A]with/with [B]in/in [C]in/with [D]with/in(4)Hi
• The teacher is writing ____a piece of chalk on the blackboard while the students are writing ____ink in exercise books.A with,inB in withC in,inD with,with
• The boy wants to have a piece of paper ___.A.to write B.to write in C.writing D.to write on为什么不用to write in而用to write on呢？
• 翻译he is writing on the blackboard with a piece of chalk